Add full logging to pc-updatemanager commands

Now a duplicate of all console output will be sent to:
/var/log/pc-updatemanager.log

Fix an issue with using CUSTOM repo URLs, now we can set
%VERSION% and %ARCH% in the repo string, which will be parsed
out during regeneration of the pcbsd.conf pkg repo files
Merge branch 'master' of github.com:pcbsd/pcbsd