Modified the format of the pitch_shift log file: Added a column of voice onset
Making sure that multiple pert types work in genRandScript
Adding the option of using a ASCII-format full schedule file to specifiy
the trial schedule in the rand phase.

See the FULL_SCHEDLUE_FILE field in expt_config.txt.
It needs to be always flanked by a pair of double quotation marks.
To disable it, just type in ""