partialy Revert 'buildsystem: always clean up $INSTALL / .$TARGET_NAME on rebuild'

breaks llvm build. llvm/package.mk needs some rework

closes #2723
Various adding to easy the compiling and editing work at my side (A number of commits squashed into one).

Added helper file to get the repository.
Added upstream to the repository.
Added file to compile my version.
Added emacs desktop file.
Modified helper file to get the repository: added instruction to get upstream branches
Added file to write down what the test of this branch told me.
Added bash script to rename files using git command, so it's easier to commit.
Added bash script to clean the xbmc build instances.
Fixed the script to clean the xbmc build dir.
Added the branch indication to the make log file.
Renamed make helper script and changed log file name.
Added git sha1 sum to log file name.
Updated emacs destop status file.
Add a comment to a build helper file.
Split make helper file, one for ion, another for generic cpu.
Fix name of make helper file for ION.
Added new helper make file for AMD+NVIDIA.
Renamed make helper file for AMD+Nvidia, 64 bit.
Changed name of the make helper file for AMD+NVIDIA.
Changed helper file.
[build] Modified help file to build the Generic project.
[helper files] Added a new bash script to build Generic amd64
[xbmc] Add helper bash script used to rename patches.
Added new project for AMD+NVIDIA.

Set the correct processor type for AMD.
	With this flag the following processors are possible:
	Athlon x2 7x50, Phenom II x3/x4, Phenom II, Athlon II x2/x3/x4, Turion II.
	FX-8xxx/6xxx/4xxx (Bulldozer).

Updated linux kernel configuration for AMD processors. Enbled driver for my hardware.
Modified Linux Kernel configuration: added CPU frequency scaling driver for AMD processors.
projects/AMD_NVIDIA/linux : add Marvell SAS support to supported projects. Updated to linux-3.2.31.
Remove xbmc-frodo from buil helpers. From now on it's only xbmc.
[helpers] Updated the ION build helper file to the new OE version.
projects/AMD_NVIDIA/linux: Updated to linux-3-6.2.
projects/AMD_NVIDIA/options: Updated options.
projects/AMD_NVIDIA/linux: update configuration to linux 3.9.5
projects/AMD_NVIDIA/options: update to Generic version
[helper files] Modified my project build helper file
Change the version tagging to take into account both the branch name and the git hash, not the release progressive number
[system] Updated to lm_sensors 3.3.4 the modified /etc/sensors3.conf file for hardware with W83627DHG-P hardware monitor chip.
projects/AMD_NVIDIA/linux: update configuration to linux 3.9.6
projects/AMD_NVIDIA/linux: update configuration to linux 3.9.7
projects/AMD_NVIDIA/linux: build cfg802011 as a module
projects/AMD_NVIDIA/linux: update configuration as in master branch for other projects
projects/AMD_NVIDIA/linux: enable NUMA on 64bit
projects/AMD_NVIDIA/linux: update configuration to linux 3.9.8
projects/AMD_NVIDIA/linux: update configuration to linux 3.10
projects/AMD_NVIDIA/linux: update configuration to linux 3.10.1 (partial)
projects/AMD_NVIDIA/linux: update configuration to linux 3.10.2 (partial)
projects/AMD_NVIDIA/linux:  CONFIG_TUN must be built-in