Make time of day an input variable

[GoogleCodeExporter]

(Issue copied here from SFCTA Asana task)
Original issue:
When using DTA Anyway to build an AM network, DTA Anyway imports a PM schedule. 
This task is to pull out hard-coding of "PM" period so that time of day can be 
specified in DTA run script. Also create a user note to specify the hour of 
interest for traffic signal import, e.g. 5p-6p instead of 3:30p-6:30p.

Update:
Discovered some additional problems. Did a quick fix for now, but will come 
back later and replace the "AM" and non-"AM" scripts with a single set that 
takes time period as an input.

Need to convert all times and time periods to lookup values based on time 
period input. Several scripts refer to time-specific fields, e.g. lane_am or 
buslane_pm. Suggest adding time periods to Util.py so "AM" value in run script 
will lead lane_am being used and tpplus transit line import knowing time period 
is 3hours and starts at 9:00am.

Moving back date to allow immediate attention on validation and project model 
runs.

Original issue reported on code.google.com by dan.tisc...@sfcta.org on 20 Jan 2015 at 8:02