(svn r12252) -Fix [FS#1801]: Broken FollowTrack_t related functions (thanks michi_cc).
-Fixed by removing FollowTrack_t structure and all related functions. Their purpose was to allow to call track followers from C code. They were:
1. never used
2. obsoleted by switching to C++

(svn r12066) -Codechange: Rename GetBridge for the more common GetBridgeSpec
-Codechange: Remove direct access to the _bridge table in favor of the above mentioned GetBridgeSpec
-Codechange: Rationalize the use of Bridge type pointer

(svn r8899) -Fix

Remove the unused second parameter from GetTileRailType()

(svn r8392) -Fix

Use HASBIT() instead of implementing it manually

(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make.
- Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
- A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
- Proper support for OSX universal binaries.
- Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
- Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.