Temporarily disable Save All Draft button

While #609 is unresolved don’t ever enable the Save all as Draft
button.  Place some explanatory text in the title to inform users of
why the button is disabled.  Also in case I missed anywhere this button
would be enabled I replaced the action on click with another warning
message.
Merge pull request #610 from jrjohnson/609-disabledraftbutton

Temporarily disable Save All Draft button
added explode to account for shib 'mail' attributes returned as a 'SAML1;SAML2' string value
Merge pull request #612 from thecoolestguy/multi_mail_attribute_handling

added explode to account for shib 'mail' attributes returned as a 'SAML1...
Deal effectively with large audit_atom table

Instead of attempting to write logs and delete rows in a single pass
run loops which break the task into manageable pieces which do not run
out of memory.  Using this system even tables with tens of millions of
records can be effectively managed.
Ensure Ilios_Logger can rotate large files

Instead of attempting to read the file into memory, write it out in
much smaller chunks.
Merge pull request #613 from jrjohnson/splitauditcron

Deal effectively with large audit_atom table
updated CHANGELOG.txt and version.php files, ready for release 2.4.2
Merge pull request #615 from ilios/rb2.4.2

updated CHANGELOG.txt and version.php files, ready for release 2.4.2
Fix for session not opening on course manager

revert change in 30e9c8d0227758c593a61923de8f3174829e66d8 that stopped
accepting GET parameters for the session_id on the course manager.
Merge pull request #616 from jrjohnson/coursesessionfix

Fix for session not opening on course manager
updated version.php to reflect next release version
enforcing UTF-8 priority for mb_detect_order for CSV enrollments
fixed indentation
Merge pull request #618 from thecoolestguy/setversion243prerelease

updated version.php to reflect next release version
Merge pull request #619 from thecoolestguy/mb_detect_encoding_utf8_fix_for_csv_group_upload

enforcing UTF-8 priority for mb_detect_order for CSV enrollments