fdo#72793 Add Excel 2010 functions

T.DIST, T.DIST.2T, T.DIST.RT, T.INV, T.INV.2T, T.TEST
Also, fixed some incorrect string assignments in
formula/source/core/resource/core_resource.src from previously
added Excel 2010 functions.

Change-Id: Ia4d13e7597d2a054d345a08b66b878f91c43f872
Reviewed-on: https://gerrit.libreoffice.org/7226
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>