libdb: Add a couple of support routines to update the account_update
flag in the nodes table when a user changes his info. Two routines, one to do it by type (as for widearea nodes) and another to do it by project (as for local) nodes. This last is kinda inefficient, but probably not too big a deal. mkacct: Two changes. 1. Use the above changes in libdb when a user changes his info. With this change, no longer need to do an account update in the experiment page for the ron/wa nodes. The nodes are marked as needing the update in mkacct, based on the nodes the user has access to. Note, this change applies only to widearea nodes; still need to use the update option in the experiment menu for local nodes, although I plan to change that to at some point by adding a watchdog on the local nodes. 2. ssh2 key support. The DB can now store both ssh1 and ssh2 keys, however those keys are handled differently when creating the auth keys files for users. There are actually two files created now, the second being the ssh2 key file call authorized_keys2. This change is mirrored in the client side code as well.