Shared build-system files for (some) parts of Taler.

A repository using these build-system files should be structured as follows:

<my-repository.git>
- bootstrap (copied/adjusted from bootstrap.template)
- configure.py (copied/adjusted from configure.py.template)
- build-system (directory containing build system "stuff")
--| taler-build-scripts (git submodule of taler-build-scripts)

Directory Structure:
--------------------

conf:
- contains mixed configuration data, mostly for linters and editors