* when creating an image from a node, make sure the new image
   gets the MBR version used by the existing image
 * when loading a single-partition image that requires a different
   MBR, invalidate all other existing partition ("invalidate" in the
   sense that we remove any partitions table entries, we don't do anything
   to the disk)

I'm sure there was a reason for this at one time, but I don't recall it...

Fix Ticket #211 by reporting all the unacceptable node types at once.

the User Name (or id) in various tables.  This also involved adding
the field to the newproject, joinproject, and moduserinfo forms.

Note: also modified 4.149 database-migrate.txt entry to add a note
to add the necessary "slot" to table_regex.

checking.

I think this fixes flyspray bug #51.

creating a whole disk image with the "Easy" form.

the script to not add the leader to the new group (membership list).

isadmin checks).

         www/beginexp_form.php3 - No initial whitespace in plab Slice Description textarea.
         sql/database-fill.sql - Use default:fulltext for 'experiments','expt_name'
             to allow multi-line Slice Description in plab_ez->beginexp->batchexp.
         www/moduserinfo.php3 - Pass null string for optional usr_addr2 and notes fields.
         backend/moduserinfo.in - Null string attr comes from XML as an undef value.
         db/User.pm.in - Distinguish between undef and null string in ModUserInfo.

     www/newimageid_ez.php3 - The reworked PHP page.  Calls Image::NewImageId with ez=1.
     www/newimageid.php3 - Call Image::NewImageId with ez=0.
     www/imageid_defs.php - Re-use the Image::NewImageId class method, adding an 'ez' arg.
     backend/{newimageid_ez,GNUmakefile}.in configure configure.in - New backend script.
         After checks, calls OSinfo->Create and Image->Create with the same XML args array.
     db/Image.pm.in - Re-use the Image->Create method, adding an imageid over-ride arg.
     db/OSinfo.pm.in - Filter out extraneous db slot args from XML in the Create method.
     db/libdb.pm.in - Add TB_{OS,IMAGE}ID_* constants from dbdefs.php3 .
     sql/database-fill.sql - Add OS entries to the table_regex 'images' pattern set.

     www/editgroup.php3 - The reworked PHP page.
     www/editgroup_form.php3 - Removed, form merged into editgroup.php3 .
     www/showgroup.php3 - Link to editgroup.php3, rather than editgroup_form.php3 .
     www/group_defs.php - Add an Image::EditGroup class method
                            bridging to the script via XML.
     backend/{editgroup,GNUmakefile}.in configure configure.in - New backend script.
     db/Group.pm.in - Add an EditGroup worker class method for script arg checking.
                      Also the missing NonMemberList and CheckTrustConsistency methods,
                      and a GETTRUST flag to MemberList, as in the PHP version.
     db/User.pm.in - Add the missing but tiny {Set,Get}TempData methods.
     sql/database-fill.sql - Add gid_idx to the table_regex 'groups' checking patterns.

     www/newimageid.php3 - The reworked PHP page.
     www/imageid_defs.php - Add an Image::NewImageId class method
                            bridging to the script via XML.
     backend/{newimageid,GNUmakefile}.in configure configure.in - New backend script.
     db/Image.pm.in - Add a Create class method for script arg checking.
     sql/database-fill.sql - Add to the table_regex 'images' checking patterns.

     www/editsitevars.php3 - The reworked PHP page, including
       a SetSiteVar function bridging to the script via XML.
     backend/{editsitevars,GNUmakefile}.in configure configure.in - New backend script.
     sql/database-fill.sql - Add table_regex 'sitevariables' checking patterns.

Enumerate the boolean slots of the node_types table in table_regex.  Use it in editnodetype.in, plus a little fix for new_type checking.

       Note: new_node attributes have not yet been converted from
       names for osid's and imageid's to new-style integer indices.
     www/editnodetype.php3 - The reworked PHP page, including
       an EditNodeType function bridging to the script via XML.
     backend/{editnodetype,GNUmakefile}.in configure configure.in - New backend script,
       including wildcarding on %xmlfields table entries to handle dynamic attributes.
     sql/database-fill.sql - Add table_regex 'node_types' checking patterns.

     www/editimageid.php3 - The reworked PHP page.
     www/imageid_defs.php - Add an Experiment::EditImageid class method
                            bridging to the script via XML.
     backend/{editimageid,GNUmakefile}.in configure configure.in - New backend script.
     db/Image.pm.in - Add an EditImageid worker class method for script arg checking.
     sql/database-fill.sql - Add to the table_regex 'images' checking patterns.

     www/editexp.php3 - The reworked PHP page.
     backend/{editexp,GNUmakefile}.in configure configure.in - New backend script.
     www/experiment_defs.php - Add an Experiment::EditExp class method
                               bridging to the script via XML.
     db/Experiment.pm.in - Add an EditExp worker class method for script arg checking,
                           And a missing description method.
     sql/database-fill.sql - Add to the table_regex 'experiments' checking patterns.