Adds support for localtime.  From Max Neklyudov
Update ChangeLog
Define interfaces to use an alarm instead of an interval timer with the tickless option
Tickless: If using an ALARM, then really should report time of expiration
Fix conditional compilation error
Update README files
Tickless Stuff:  Back out the risky timer operations when the ready-to-run list is modified.  That is unsafe.  An ugly workaround is just to keep an interval timer going all of the time with a minimum duration equal to the timeslice interval.
Fix warning caused by change in mktime prototype
Updated comments
Sudoku needs a .gitignore
Update ChangeLogs and ReleaseNotes for 7.4 release (not complete)
Update ChangeLogs and ReleaseNotes for 7.4 release (not complete)
Update remaining documents for the 7.4 release
Minor changes for OpenSUSE 13.1 build; update a couple of configurations in include kconfig-frontends build
Correct release notes, updat changelog, fix some conditional compilation
When reading the system timer, don't read a struct timespec, convert it to a fake tick count, then back to a timespec.  Remove CLOCK_ACTIVETIME.. it is non-standard, unused, and gets in the way of changes like this
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libc/time/lib_localtime.c is much closer to NuttX coding style. libc/time/private.h removed; incorporated into lib_localtime.c
Remove libc/time/tzfile.h; content moved inside of libc/time/lib_localtime.c
Update ChangeLog