move debug/release flags from target to general flags, fixes #571

add configure command line to config.mk, fixes #563

add command check to check_c_compiler/check_cpp_compiler, because some shells print an error if it doesn't exist

rename debug/release flags, fixes #570

fix that predefined CFLAGS etc. are ignored

add detection for invalid option values - fixes #518

fixes debug/release options only showing when other options are specified - fixes #528

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