Improvement : Eleminate Sed utility from the requirement for data import

[jobinau]

There were historical reasons why Unix/Linux Sed is used for cleaning up the data collected before importing it. Many of those cases are gone over a period of time with multiple revisions. Now, conceptually it is possible to have collected data clean enough for importing. So the use of Sed utility can be eliminated.

[jobinau]

This is addressed in the commit : https://github.com/jobinau/pg_gather/commit/331590b7d0845f9148f41a1ff6527b5f93a5d053 Testing in progress. Possibly update the documentation later based on test feedbacks.

[jobinau]

A simple psql -X -f gather_schema.sql -f out.txt should work now. basic units tests show successful results