GitLab

- Added a 'common' directory where all shared code has been placed
- Analytics package has been moved out of dcdbpusher, now has its own makefile
- Some renaming here and there for uniformity

Explicitly cast arguments to DCDB:Timestamp constructor to uint64_t to avoid ambiguities with different compilers

Rework DCDBQuery::doQuery() and DCDBQuery::genOutput() to leverage proper regular expressions for function-, sensor-, and modifier-parsing.

Bugfix: Parse for functions and modifiers in a sensorname string first, then lookup the actual sensor name in the DB

Introduced a bit mask for sensor properties in dcdblib and dcdbconfig (e.g., integrable, monotonic,...)

Added functions like Deltas, Integrals and Derivatives to queries. Still need to fix unit conversions and scaling factors for all functions.

Split build and install into different targets: deps and depsinstall for dependencies, all and install for DCDB components