Per FS#2884, implement a local version of str_getcsv() to maintain
compatibility with php 5.2.x (str_getcsv() is only available in
php 5.3+ and is used by user manager import feature.

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test import against auth plugin which doesn't allow adding users

Add unit tests for usermanager import & export functions

Improvements to facilitate unit testing
- don't die at end of _export()
- internal classs wrapper method for is_uploaded_file() to allow
overriding for use under cli & without having to upload a fi

Improvements to facilitate unit testing
- don't die at end of _export()
- internal classs wrapper method for is_uploaded_file() to allow
overriding for use under cli & without having to upload a file

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MINOR: comment spelling corrections

IMPROVEMENT: remove generated password from import failure data

Bugfix: correct variable name to

FS#2888 fix for templates

fix numeric expression read in plugin default conf FS#2888

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refactor PageRevisionLog into Media- and PageChangelog extending Changelog

update function calls to changelog functions

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