fixed RPM packaging
added script which installes siso rpms
fixed script
linking siso libraries to libpco
linking siso libraries to libpco
fixed prepare script
Load correct framegrabber plugin
Replace checked in binaries with those from vendor

Moreover, this commit removes the faulty menable driver that most likely crashes
the system. Please refer to the SiSo website and use at least menable 3.9.14.
Prepare release of version 0.4
Bump to next development version
Fix the firmware problem already fixed in libuca
Added documentation from the PCO camera control commands document to selected functions.
Add pco_get/set_framerate
Ignore build/ dir
Return NULL if no port is connected to a camera
Update NEWS for 0.4.1
Do not require a C++ compiler
Major break: fix SO version to major version

Until now, the SO version was increased with each minor version step. This is
neither good nor correct. With this change the SO version is set to the major
version, e.g. now to 0. This will break parallel installations of libpco, so
remove any old libpco libraries!
Re-arrange CMakeLists
Use ConfigurePaths for install locations