Updating code to more recent version of the the dependencies

See merge request !3

Partons v2

See merge request !2

missing)
Change number of nodes in TrapezoidalIntegration1D from 50 to 40 (for
compatibility with other integration routines)

Implement version information

See merge request !1

module naming #24
(modification agreed with Herve during his stay in Warsaw)

characters (and not cast from integer) #24

rule probing function in equidistant steps between ln(a) and ln(b) 

- Add layout scheme to match PARTONS 
- Apply current style
- Update doxyfile
   - update titles
   - update mathjax script
   - make it similar to PARTONS doxyfile

- Generate tag file to be used by PARTONS documentation.

- Add missing build/ folder.
- Add .gitignore.
- Fix FindElementaryUtils.cmake.