proycon/clam: v2.3

Update with various enhancements and fixes. Investigate increased flexibility in cross-domain loading XSL of stylesheets #63 Implement support for external configuration files (yaml) #67 (needed for LaMachine v2) Allow pre-setting global parameters #66 (needed for CLARIN LR switchboard) implement CUSTOMHTML_PROJECTFAILED #42 [ui] center "show input files" button? #44 Clean up info page (RESTful specification), doesn't filter duplicate output templates + minor issues #6