Adds rmcp support (for new wifi pcs) to the power command. For now, you

have to re-run the swig-wrappers target in tools/rmanage/GNUmakefile to
generate the wrapper and perl module; this must of course be done when
changes are made to the rmcp libs.

  * GNUmakefile.in, configure, configure.in: add tools/rmanage
  * tbsetup/GNUmakefile.in, tbsetup/power*.in: add rmcp to power command
  * tools/GNUmakefile.in: add rmanage
  * tools/rmanage/*.c,*.h: bugfixes, swig helper methods, etc.
  * tools/rmanage/rmcp.i: swig import control file
  * tools/rmanage/rmcp.pm,rmcp_wrap.c: rmcp wrapper/module generated by swig