Fix problems with labeling gas injectors

[eldond]

• Gas injection direction fix
  • Gas injectors have an exit location and also a second_point
  • Together, they define the direction of injection, where the exit is the source and the second_point is the target (towards the plasma)
  • omas_plot bundles pipes that are at the same poloidal location and uses one arrow to represent the group, based on the second point location (r2, z2) of the last injector of the group
  • Now, if the last pipe in the group doesn't have r2, z2, it will try to copy r2, z2 from the previous pipe.
• Labels for groups of injectors
  • Option to print the names of all the injectors at a particular R,Z exit location (on different lines)

[codecov[bot]]

Codecov Report

Merging #118 into master will increase coverage by 0.95%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   77.57%   78.52%   +0.95%     
==========================================
  Files          46       46              
  Lines        8606     8675      +69     
==========================================
+ Hits         6676     6812     +136     
+ Misses       1930     1863      -67     

Impacted Files	Coverage Δ
omas/tests/test_omas_plot.py	99.00% <ø> (-0.31%)	:arrow_down:
omas/omas_plot.py	78.13% <100.00%> (+4.62%)	:arrow_up:
omas/omas_sample.py	99.48% <100.00%> (+0.07%)	:arrow_up:

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[orso82]

@eldond let me know when it is ready to merge

[eldond]

@orso82 Ready when it passes all the checks.

[eldond]

@orso82 It's ready.