mv bsecoupling defaults to the xml files

[felipeZ]

Proposed changes

Remove the default values from the header file of bsecoupling into the Calculator XML files (e.g. iqm)

[codecov]

Codecov Report

Merging #451 into master will decrease coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #451     +/-   ##
========================================
- Coverage    63.3%   63.3%   -0.1%     
========================================
  Files         279     279             
  Lines       22790   22787      -3     
========================================
- Hits        14437   14434      -3     
  Misses       8353    8353             

Flag	Coverage Δ
#gcc	63.3% <100.0%> (-0.1%)	⬇️

Impacted Files	Coverage Δ
include/votca/xtp/bsecoupling.h	100.0% <ø> (ø)
src/libxtp/bsecoupling.cc	66.5% <100.0%> (-0.4%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a3865e2...d1a6265. Read the comment docs.

[junghans]

Maybe add a test.

[felipeZ]

Maybe add a test.

@junghans I am creating a Jupyter notebook with the tutorial, where we can test this functionality