Merge pull request #46 from fqqb/next

New channel widget + misc
Yamcs PP Simulation:
- Added executable (yamcs-pp-simulation.sh/.bat)
- Added documentation
- Updated RPM installer to embbed PpSimulation lib and bin files
- Fixed small issue in SimulationPpProvider.java
Merge pull request #47 from m-sc/yamcs-simulation

Yamcs PP Simulation:
changelog for the upcoming 0.26.1 release
Merge pull request #48 from fqqb/next

Fix potential NPE with PPs and alarms
bumped version number
Prepare 0.26.2 builds
Expose channel from XtceTmProcessor
Data count should return #pps, not #messages