Fixed NPE when adding local disk
updated panel sizes so that LocalDisk options were displayed
chnages to timeline userdocs to reflect modified cluster expansion UI
Merge pull request #924 from millmanorama/release-3.1.1

chnages to timeline userdocs to reflect modified cluster expansion UI
updated report logo
Updated docs for services and utilities
Updated docs for services and utilities
reports: force new generator logo, do not dislpay raw tool output in report, change alignment to left instead of center for HTML
Merge branch 'release-3.1.1' of github.com:sleuthkit/autopsy into release-3.1.1
removed extra heading rows from Excel report so that the report is just the table data