Fix how we do major updates / branch changes.

Do the package downloading after rebooting with new kernel, in order
to make sure we can run the new pkg ABI
Retire the pc-gdmconf utilty, replace it with pc-dmconf for 10.x
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Turn on the COOKIES flag for the "curl" package. Request on TRAC #811.
Fix the pbi_metatool for 10.x, use a placeholder PNG image when using
the "syncpbi" option to auto-populate the metafile
Merge branch 'master' of github.com:pcbsd/pcbsd
Use the PBI_ICONURL variable in a PBI, if it exists, when updating meta-file
Massage PBI_MAKEPORT to remove any trailing '/'
Fix how we import / parse a PBIs description, convert \n to <br> and other
websafe stuff
Remove GDM requirement from pcbsd-base
Fix detection of the NVIDIA driver during installation, /etc/X11/xorg.conf no longer always exists
Make sure that when PCDM is looking for the existance of the "tryexec" *.desktop value it searches the entire PATH rather than just /usr/local/bin
Merge branch 'master' of github.com:pcbsd/pcbsd
Fix a bug in the recent PATH commit for PCDM where I used the wrong integer variable.
Fix a PBI bug with nvidia drivers, needs some extra libs
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Merge remote-tracking branch 'upstream/master'
PCBSD Update center: PBI update prototype is ready