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Change Math.hpp to use namespace yade. Minimal changes only. No cleanup yet for boost::multiprecision or float128.

ctags cannot sometimes detect class names, when they are inside macros, etc. So create anchors inside forCtags{};

start journey towards `long double`, `float128` and `multiprecision::mpfr` as Real, by working on issue #57: add namespace yade (this commit has "simple files" only)

plug flowengine leaks, increase code flexibility for GPU usage and linking to custom suitesparse libraries

Prepare code to enable float-conversion warning, never use abs(…) without std:: due to this mess: https://stackoverflow.com/questions/21392627/abs-vs-stdabs-what-does-the-reference-say

Fix unused-variable warnings when LOG_* macros are not used and variable is not printed (not used at all).

Add Logging config file support, readConfigFile(…), saveConfigFile(…); load default config on startup.