Installation via DKMS

This replaces install.sh/uninstall.sh with script installing sources into
/usr/src and adding them as DKMS module.

Using DKMS ensures MPSS drivers are installed & built on every kernel update.

See: http://linux.dell.com/dkms/manpage.html

Previous manual installation provided if no DKMS found:
  make && sudo make install

Help it provided by:
  ./install --help
improve upon previous commit

- setting MIC_CARD_ARCH to k1om per default in Makefile
- added "clean" to Makefile targets
- edited README accordingly
- added "--no-header" flag
- replaced "--prefix" with "--sysconfdir" and "--includedir"
- removed "sudo" before tar
- added install routine for developer header files
- added hint that no config or header files get removed
- some small fixes not worth mentioning