Updated version to 12.18.1

Release to support xSDK.

Merge Pull Request trilinos#6142 from trilinos/Trilinos/master_merge_…

…20191023_111521

Automatically Merged using Trilinos Master Merge AutoTester
PR Title: Trilinos Master Merge PR Generator: Auto PR created to promote from master_merge_20191023_111521 branch to master
PR Author: trilinos-autotester

Merge Pull Request trilinos#6142 from trilinos/Trilinos/master_merge_…

…20191023_111521

Automatically Merged using Trilinos Master Merge AutoTester
PR Title: Trilinos Master Merge PR Generator: Auto PR created to promote from master_merge_20191023_111521 branch to master
PR Author: trilinos-autotester

Merge pull request trilinos#4499 from trilinos/jwillenbring-release-1…

…2-14-1

Update Version.cmake for release 12.14.1

Merge Pull Request trilinos#3434 from prwolfe/Trilinos/add_RIG

Automatically Merged using Trilinos Pull Request AutoTester
PR Title: This commit just adds a Redundant Include Guard to Epetra_config.h.in
PR Author: prwolfe

Merge Pull Request trilinos#3434 from prwolfe/Trilinos/add_RIG

Automatically Merged using Trilinos Pull Request AutoTester
PR Title: This commit just adds a Redundant Include Guard to Epetra_config.h.in
PR Author: prwolfe

Update version to 12.12.1

Trilinos 12.12.1

Root of Trilinos 12.12 branch

Trilinos 12.12 initial point