finally??? cvs works again???? let me dig up my week-old cvs

finally??? cvs works again????  let me dig up my week-old cvs
commit message.....

i'm becoming very happy with check_apt now :)
- now has support for an externally (configure.in) path to apt-get,
  though i still have that in #ifdefs for the time being.
- support for defining what packages are "critical updates", via
  the already-existing security regexp or overridable on the cmdline
- allow overriding of apt-get cmdline options
- introduce a "no upgrade" in case someone just wants to check that
  they can download the package lists with -u but not check for upgrades.
  might need to change the name of this option to prevent confusion.
- improved -h documentation

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1366 f882894a-f735-0410-b71e-b25c423dba1c