ignore .DS_store
SUB_QP now detects user
minor
Added Twiss input
minor
minor
various changes

param_struct replaced by input_struct, computational parameters moved
in MAKE_RP, added param Use_Destroyer and qpic_executable
fix issue "plasma.r and plasma.n not found"
param_struct replaced by input_struct; all input parameters at the
start of the code
SI_consts line moved up
fixed input_struct.comp.run_time error
calc of alpha and beta from waist position
minor
Corrected typo emit_y = emit_x
fixed input_struct.comp.qpic_executable
uncomment qsub
minor
Sim_201
Sim_201
minor