Make StMuFmsCluster constructor explicit
Make StMuFmsPoint constructor explicit
Make single-argument constructor explicit
Make StFmsTower constructor explicit
Clean up new parts of StMuFmsCollection
Fixes whitespace inconsistencies

Addresses a number of things spotted with cpplint:
 - replaces tab characters with spaces
 - fixes lines ending with whitespace
 - adds spaces around or before brackets, symbols etc
Replace unsigned short with UShort_t
Add name for method argument
Add comment about method signature
Rename fit parameter variable to reflect constness