[MDL-34086] META: Increase robustness of upgrade from 1.9 to 2.2 - Moodle Tracker

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Use this META bug to group and prioritise problems found in the 1.9 -> 2.2 upgrade.

All fixes here should be ported to 2.2.x only.

has been marked as being related by

MDL-36126 Error restoring a Moodle 1.9.x course to Moodle 2.x due to long filenames

1.	Sites using 1.9.x, but originally installed with < 1.7, fail upgrading to 2.0 due to null fields in mdl_user table	Closed	Mark Nelson
2.	Upgrade 1.9.x -> 2.0 fails: column "city " contains null values	Closed	Aparup Banerjee
3.	improve mysql collation handling	Closed	Petr Skoda
4.	Force language not displayed in course settings after upgrade	Closed	Petr Skoda
5.	Presets lost after upgrade from 1.9.12 to 2.0.4 to 2.1.1	Closed	Mark Nelson
6.	mdl_resource upgrade bug: Data too long for column 'mainfile'	Closed	Mark Nelson
7.	2.1 Upgrade fails in mod_folder section	Closed	Unassigned
8.	Moodle 1.9 to 2.x restore of course with a display directory	Closed	David Mudrák (@mudrd8mz)
9.	Upgrade to 2.0.2 fails if certain fields are null in user or resource table	Closed	Mark Nelson
10.	Sites installed with Moodle version < 1.7 using Postgres have null database columns	Closed	Mark Nelson
11.	Error on upgrade to Moodle 2.0	Closed	Mark Nelson

Component watchers:: David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo, David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo