Many DB Updates and a few new features

Added the following columns to: cronjobs 
- title - brief title - I need this as I have a snippet called many times and hard to tell which is which 
- description - description of what job is doing easy way to document 
- debug - Boolean, send to the modx error log some messages 
- set_nextrun - SET('Load','Success') nextrun can be set on Load or on Success of job, this will allow a job not run forever when it fails. 
- auto_clearlogs - 0 for never, Number of Minutes/age of log to clear
Added the following columns to: cronjobs_log 
-start_time - Time that job is called- logdate would be time finished 
-memory_peak - Memory peak of job in MB 
-status - SET('Started','Completed') 
-execution_time - Caluclated time in miliseconds

Added Indexes to: cronjobs_log
Added the above fields to the UI
Added the above fields in the EN Lexicon
Added in try/catch for cron.php and will log error as message