This patch includes:

* version column removed from modules table, now using standard config, this allows decimal version for modules
* version column removed from block table, now using standard config, this allows decimal version for blocks
* module version.php can safely use $plugins instead of module
* new plugin_manager bulk caching, this should help with MUC performance when logged in as admin
* all missing plugins are now in plugin overview (previously only blocks and modules)
* simplified code and improved coding style
* reworked plugin_manager unit tests - now using real plugins instead of mocks
* unit tests now fail if any plugin does not contain proper version.php file
* allow uninstall of deleted filters

This reverts commit c724e009.

This fix is for dialogues that are not created until some time after the page
has loaded.

Conflicts:
	theme/bootstrapbase/style/moodle.css

Conflicts:
	theme/bootstrapbase/style/moodle.css

Conflicts:
	theme/base/style/core.css
	theme/bootstrapbase/style/moodle.css

Also, changing couple of the sub header to use notification, which is more appropriate.

Also applies to various other situations where backup includes 0 of
something. This was caused by a problem in the progress-tracking code.