allow custom line breaks in help text

add helptext descriptions for features

trim all contents by default - relates to #317

trim indents by default - fixes #317

replace -a with && in configure

fix that a broken configure file is left over when something goes wrong

fix empty dependencies element producing broken configure script - fixes #336

fix duplicate output when checking dependencies

add --init and --update options

arg attribute in option element is required

add support for config.site - fixes #313

remove golden sample tests because they are not needed anymore

start development of version 0.2.0

Added tag v0.1.0 for changeset 7e523ed15146

release version 0.1.0 v0.1.0

fix missing error reporting when all option defaults fail - fixes #299

(0) -16 +16 tip

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