Mostly cosmetic changes and an example

[pokutta]

• added a simple example for the open-loop parametrization
• changed to "LMO:" abbreviation

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (800a2fe) 87.04% compared to head (2bafbe0) 87.04%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #431   +/-   ##
=======================================
  Coverage   87.04%   87.04%           
=======================================
  Files          20       20           
  Lines        2439     2439           
=======================================
  Hits         2123     2123           
  Misses        316      316           

Files	Coverage Δ
src/afw.jl	94.89% <100.00%> (ø)
src/blended_cg.jl	83.41% <100.00%> (ø)
src/fw_algorithms.jl	85.20% <66.66%> (ø)
src/pairwise.jl	72.35% <0.00%> (ø)

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[pokutta]

ready to merge @matbesancon ?