Api changes

[anilbey]

EModelRunner accesses generate_channels_by_location, generate_reinitrng and range_exprs_to_hoc.

This PR makes them public.

Todo

• [X] make sure EModelRunner tests pass with these changes

[codecov-commenter]

Codecov Report

Merging #443 (c6d28a9) into master (b2c9ac3) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #443   +/-   ##
=======================================
  Coverage   87.91%   87.91%           
=======================================
  Files          50       50           
  Lines        4285     4288    +3     
=======================================
+ Hits         3767     3770    +3     
  Misses        518      518           

Impacted Files	Coverage Δ
bluepyopt/ephys/create_hoc.py	92.70% <100.00%> (+0.16%)	:arrow_up:
bluepyopt/ephys/locations.py	86.95% <100.00%> (ø)

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