Post MDL-29322 : create one XMLDB report to allow admins to change the whole DB to CHAR semantics

Oracle DB needed: 1) Install Moodle 2.2 (master) from scratch 2) Run Admin -> Development -> XMLDB Editor -> Check semantics 3) TEST: 0 wrong semantics found with message about no further actions needed. 4) TEST: The detailed log shows all columns with Ok message. 5) Install Moodle 2.1 (21_STABLE) from scratch and upgrade to Moodle 2.2 (master) 6) Run Admin -> Development -> XMLDB Editor -> Check semantics 7) TEST: Some wrong semantics will be found. Annotate the number. 8) TEST: The detailed log shows columns with Ok message and columns with current/expected message 9) Pick some (not all) of the SQL suggested code. Annotate the number. 10) Execute it against the DB in your fav. interface 11) TEST: The alter table statements are executed without error. 12) Run again Admin -> Development -> XMLDB Editor -> Check semantics 13) TEST: The number of wrong semantics = the annotated @ point 7 - 9 above 14) Execute all the remaining SQL statements. 15) TEST: All them are executed without error. 16) Run again Admin -> Development -> XMLDB Editor -> Check semantics 17) TEST: 0 wrong semantics found with message about no further actions needed. 18) Run all DB functional tests against Oracle. 19) TEST: Only the well-known "concat not ansi" one should fail. That is, thanks!