pspg 5.2.0 released

https://github.com/okbob/pspg/releases/tag/5.2.0

There are only two, but I hope important, features.

First feature is "progressive data load". Before this release, pspg loaded all rows before first print to screen. Now, with progressive data load, only 500 rows are loaded, these rows are printed to screen, and repeatedly next 2000 rows are loaded. Although the load should not be complete, almost all pspg commands can be used.  

pspg is designed for browsing tabular data. But it can be used for plain text too. This is important - psql can produce lot of data in plain text format - (\? \h). Now, pspg can highlight some parts of these documents.