[BUILD] minor adaptions to the build system

 * removing the test_build related infos from the targets target
 * updated the pyOpenMS cmake to be a bit more OpenMS like
[DOC] removed test_build target from the documentation

 * incl. further cleanups related to the repo restructuring
Merge pull request #662 from aiche/feature/cmake-clean-ups

CMake and docu cleanups w.r.t. to the new layout
[FIX,BUILD] fix compile with boost < 1.48

- forgotten changes after revision
  ff499b9e99e0b6dbef5ce8274a61fcf610d8c94a (r11584)
- relates to issue #582
[BUILD] prepare for boost 1.40 build
[BUILD] comment out for boost 1.40 build
[BUILD] comment out for Qt 4.6 build
[BUILD] fix for libSVM 2.90  build
[BUILD] support for GLPK < 4.42
[TODOS] some missing todos:

2 tests fail:
- String_test
- GzipIfstream_test