(svn r6002) -Cleanup: remove the now redundant BASE_YEAR constant.

(svn r6001) -Feature: when removing a farm, his farmland is removed too (over time) (based on peter1138's patch, FS#82)
To make this to work, in older games farmland is removed on load, and replanted

(svn r6000) WebTranslator2 update to 2006-08-20 20:43:15
danish - 24 fixed, 1 changed by Bjarni (25)
hungarian - 2 fixed by miham (2)
polish - 2 fixed, 3 changed by meush (5)
portuguese - 3 fixed by izhirahider (3)
turkish - 54 fixed by jnmbk (54)

(svn r5999) -Feature: change the original date format to a 32 bits format based at the year 0.
The game date subsystem now allows someone to start in the year 0 and continue
up to the year 5 000 000. However, you currently cannot build anything before
1920 as there is no newgrf support for dates before 1920 or after 2090 yet.

(svn r5993) -Fix r5974: a cause-no-warning commit caused a warning ;) (glx)

(svn r5978) -Add: allow a switch in Makefile.config to disable threads in OpenTTD (no matter what system you are on). Only useful for testing.

(svn r5977) -Fix [FS#78]: never set I-am-a-thread bool to true IN the thread. Machines with
dualcore can be faster then you want, and therefor create 2 threads, while
you made the bool to make sure there is never more then 1 thread of this type.

(svn r5975) -Cleanup: use ORIGINAL_BASE_YEAR & ORIGINAL_MAX_YEAR where the functions really depend on the original date format.
-Cleanup: use DAYS_TILL_ORIGINAL_BASE_YEAR where the date variables are in the old date format and conversions are needed.
-Cleanup: replace one (forgotten) instance of uint16 with Date.

(svn r5974) -Codechange: added casts all around the place to make Windows 64bit happy (michi_cc)

(svn r5973) -Codechange: md5_append only uses size_t as nbytes param, so use that (michi_cc)