Fix Generics warnings

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611944 13f79535-47bb-0310-9956-ffa450edef68
The Event User Model fake-workbook for formula evaluations needs to know about the sheet names

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611946 13f79535-47bb-0310-9956-ffa450edef68
Fix inconsistent indents

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611947 13f79535-47bb-0310-9956-ffa450edef68
Start to update how the formula parser looks up sheets from formula ptgs, to account for the differences in how HSSF and XSSF store references to external sheets. For #56737

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611948 13f79535-47bb-0310-9956-ffa450edef68
Fix inconsistent indents/whitespace

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611949 13f79535-47bb-0310-9956-ffa450edef68
Provide XSSF-style external sheet support for areas, similar to the recent cell reference support. #56737

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1611950 13f79535-47bb-0310-9956-ffa450edef68