multi-vesion pe installation
- can now have each host identify a pe_dir to pull from
- host file supports a 'pe_dir' per node
- still uses the LATEST file (sorry, Branan)
- fixed upgrade code alongside install code
no longer have to pass version to upgrade_pe command
- fixed so that it determines the upgrade version from the upgrade path
  LATEST file
Incorrect number of arguments for load_legacy_config in vspher_helper
fix for upgrades to less than 3.0 pe
- have to apply the pre 3.0 rules for upgrades to a pre 3.0 version
- added a check for ensuring that solaris/aix/windows are agent only
add support for 2.0.3 installs
- can now have both pe_dir and pe_ver/pe_ver_win in hosts file per-node
- 2.0.3 answer file generation
code review improvements
- yard documentation for install and upgrade
- moved pe_ver and pe_dir discovery to install_pe and out of option
  parsing (only do it if you need it)
- changed answer file generation to be generically 2.0 instead of 2.0.3
Longer timeout because el4