Merge pull request #450 from jimi1283/bugfixes

BUGFIX - globbed --boot-files are not copied properly
possible fix for #589
added xenserver620 for issue #589
fixes #605
add a few direct commands in help output
Fixed small issue inside of cobbler's man page.

The man page referenced bind.template rather than named.template.
Merge pull request #646 from flavio/fix_man_page_inconsistency

Fixed small issue inside of cobbler's man page.
Merge pull request #642 from chjohnst/master

add a few direct commands in help output
Merge pull request #606 from goozbach/master

fixes #605 Reposync and exclude options.
added os_version flag to ksvalidator
Issue #614 - virtinst module is not available in new OS's
putting import statements back in sub-function
Merge pull request #652 from sdherr/master

Issue #614 - virtinst module is not available in new OS's
Merge pull request #591 from jonaz/master

Generating xenserver620 append_line correctly and distro signature.
Small fix for #654, reported by Jeus de Baldoma.
Merge pull request #655 from jmaas/master

Small fix for #654, reported by Jeus de Baldoma.
Cleanup PXE files for systems that have netboot disabled. Fixes #618
Merge pull request #656 from jmaas/master

Cleanup PXE files for systems that have netboot disabled. Fixes #618
Better checks for presence of the proxy field in buildiso.
Probably fixes #595
Merge pull request #657 from jmaas/master

Better checks for presence of the proxy field in buildiso.