Action calc in GetLLM Modified

Action calculation from calculate kick changed.  Now three calculations
for the action are done using beta from model, beta from amp and beta from
phase.  Thresholds bbthreshold and errthreshold, set by user (-e ->
errthrehsold, -k -> bb threshold), control which bpms from measurement are
included in the action calculation.  getkick in helper no longer calls
get_beta_from_amp for action calculation but instead calls gen_kick_calc,
a new function in helper.py.
Merge branch 'master' of https://github.com/pylhc/Beta-Beat.src