v0.1.1

Complete rewrite after the initial release, many fixes, almost ready for production

• The new property basedir allows to define the root directory of the source files.
• Source file names are relative to basedir or the current directory if basedir is not given.
• Fix: reading source files multiple times, now source is extracted from the compiled code.
• Fix: sometimes the line number is shifted by one.
• Better code cleanup, removal of empty lines.
• Basic but complete test.