Fix non-standard top-level indentation
Rename: Fspc ~> FSpec
Rename: Fspec ~> FSpec
Rename file names/paths: Fspec ~> FSpec (Step 1/2)

First rename Fspec ~> FSpec_RENAME, because git on Mac can't handle case changes. (setting core.ignorecase doesn't work well)
Rename file names/paths: Fspec ~> FSpec (Step 2/2)

Rename FSpec_RENAME ~> FSpec.
Rename: flags ~> getOpts