bdiff.c: Added support for py3k. This patch adds support for py3k in bdiff.c. This is accomplished by including a header file responsible for abstracting the API differences between python 2 and python 3.

diffhelpers.c: Added support for py3k. This patch adds support for py3k in diffhelpers.c. This is accomplished by including a header file responsible for abstracting the API differences between python 2 and python 3.

base85.c: Added support for py3k. This patch adds support for py3k in base85.c. This is accomplished by including a header file responsible for abstracting the API differences between python 2 and python 3.

parsers.c: Added support for py3k. This patch adds support for py3k in parsers.c. This is accomplished by including a header file responsible for abstracting the API differences between python 2 and python 3.

mpatch.c: Added preliminary support for py3k. This is done by including the util.h header file, that defines appropriate macros according to the current python version.

osutil.c: Support for py3k added. This patch adds support for py3k in osutil.c. This is accomplished by including a header file responsible for abstracting the API differences between python 2 and python 3. listdir_stat_type is also changed in the following way: A previous call to PyObject_HEAD_INIT is substituted to a call to PyVarObject_HEAD_INIT, which makes the object buildable in both python 2.x and 3.x without weird warnings. After testing on windows, some modifications were also made in the posixfile function, as it calls PyFile_FromFile and PyFile_SetBufSize, which are gone in py3k. In py3k the PyFile_* API is, actually a wrapper over the io module, and code has been adapted accordingly to fit py3k.

util.h: Utility macros for handling different Python APIs. If we are in py3k, a IS_PY3K symbol is defined. Apart from that, byte strings use the API defined in Python 2.6+ (_?PyBytes_.*). For Python < 2.6, the bytes API is defined accordingly for mercurial usage (shameless copy from bytesobject.h from Python's code). Some macros were backported from 2.6, as inspired by rPath's pycompat.h.

relink: ensure deterministic directory walk in collect

help: add "glossary" topic Joint work with Vishakh Harikumar, Pradeepkumar Gayam, David Champion, Mark Booth, timeless, Matt Mackall, Heinrik Stuart, Greg Ward, and Martin Geisler.

relink/progress: Adding progress for collecting stage

relink/progress: Adding progress for pruning stage

merge: when current branch has 1 or > 2 heads, actually abort. Currently merge just prints abort-like messages to stderr and then exits with a misleading status 0 (cleverly disguised as "False"). With this change it raises Abort, just like every other fatal error.

tags: remove inactive debugging code. It was left in just in case things went wrong with the tag cache in Mercurial 1.4, so we could easily crank up the verbosity with a one-line change. There have been no problems in 1.4 or 1.5, so it should be safe to drop this now.

tags: remove the old non-caching implementation of findglobaltags(). It was left behind just in case the tag cache blew up in Mercurial 1.4, so we could easily revert to the non-caching code. There have been no problems with the tag cache in 1.4 or 1.5, so it should be safe to get rid of this code now.