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Importing big .pot source documents with msgctxt takes a long time to complete. The current set of documents I'm using are taking more than half an hour to complete.

**** Currently there is no way of PUSHing only the delta to the source documents. The PUSH process acts like a synchronization, deleting server entries that are not present in the .pot files. ****

This makes the process slower and more server/database intensive, when integrating with Continuous Integration environments. It might also generate more unnecessary historical data in the database, causing it to grow too fast in a continuous integration environment.



Reproducible: Always

Steps to Reproduce:
1. Using zanata-cli, push an example.pot file with 2 entries
2. Using zanata-cli, push a second example.pot (same filename/document), with a third distinct entry (the ones from the first file are not there).
3. In Zanata website, open this document for translation in any language.
Actual Results:  
The first 2 entries imported with the first file are not available

Expected Results:  
All 3 imported entries should be available

If this is not default, there should be an --option to avoid deleting source document messages.