upper bound for research points depending on the population
fixed sound problems (toggle, frame close)
Merge branch 'master' into 19_backgroundMusic
rocket button only appears when the research is done
Merge branch 'master' of https://github.com/Metha-Gruppe/methapolis-java
fixed #38
Merge branch 'master' into 38_soundMemoryBug
sound bug still not fixed
Merge branch 'master' of https://github.com/Metha-Gruppe/methapolis-java
Merge branch 'master' into 45_RaumschiffSprite
fixed sound issue