remove time_t from struct you (trunk only)

There was an issue reported where save files between different
versions of a manufacturer's compiler were incompatible because the time_t
ubirthday field was changed from 32 bits to 64 bits.

32 bit time_t implementations will break at 19:14:07 on  January 18, 2038.
64 bit time_t implementations will break at 23:59:59 on December 31, 3000.

This removes the dependency on the size of time_t from the save file.
The ubirthday field is no longer embedded in struct you.
This also adds two general purpose routines to hacklib.c, one to convert a time
value to a 14 character char representation and the other to convert that
back to time_t. Those are used by the save/restore routines.

This is a savefile breaking change, so editlevel in patchlevel.h was
incremented.

include/extern.h

@@ -850,6 +850,8 @@ E char *FDECL(yymmdd, (time_t));
 #endif
 E long FDECL(yyyymmdd, (time_t));
 E long FDECL(hhmmss, (time_t));
+E char *FDECL(yyyymmddhhmmss,(time_t));
+E time_t FDECL(time_from_yyyymmddhhmmss, (char *));
 E int NDECL(phase_of_the_moon);
 E boolean NDECL(friday_13th);
 E int NDECL(night);