adding CLI Parser
adding controller stub and main entry point
adding some basic status handling
adding file traversal
adding FITSXMLComparator stub
adding first running version of the comparison tool
Merge branch 'invoke-test-tool' into cli_dev
adding comparsion results in order to capture, merge and return the results
Started README.md documentation.
Small README.md edit
More small README.md changes.
detecting global missing tools
correct checkout in script

The script file used a checkout within the same branch, which
caused all changed files to be kept in the index. This caused a subsequent
problem when compiling the fits distribution.

This commit changes the checkout in a manner that the desired version is
put into a detached head and thus replicates the exact state of the desired commit.
writing to a file, minor tool detection fix
changing xml unit for dom4j
adding FileInfoResolver
Merging command line tool prototype
adding parent project to the testing suite (fixes #3)

adding a parent project fbt (Fits Blackbox Testing).
renaming the current project to fdc (Fits DOM coparator).
making fdc a child of fbt
refactoring

refactoring resolvers a bit.
fixing some minor issues
adding metadata resolver