cont'd code review with clang++ and -Weverything (module compiler)
cont'd code review with clang++ and -Weverything (module parser)
cont'd code review with clang++ and -Weverything (module imageoutput)
cont'd code review with clang++ and -Weverything (module control)
cont'd code review with clang++ and -Weverything (module common)
bug fix introduced by code review
started code review with clang++ and -Weverything
added expressionparam test
expressiontest a bit improved
expression test completed (so far)
