Adding praat instructions in install for developers for #485
using reader roles since users must be permitted to read in order to open the database fixes #1456
not settin debug true in local mode
creating a datum for each non-null interval in a text grid for #1455 and #485 and #1260

next steps will be to enrich the textgrid2Json library to produce IGT based on teirs and use that instead...
praat import for elan, tiers by igt, tiers by speaker

fixes #1455
and for #485