planetarium: Rename *all* MIT-specific files with "mit-" prefix.

diff --git a/src/planetarium/compile.scm b/src/planetarium/mit-compile.scm
similarity index 100%
rename from src/planetarium/compile.scm
rename to src/planetarium/mit-compile.scm

diff --git a/src/planetarium/make.scm b/src/planetarium/mit-make.scm
similarity index 100%
rename from src/planetarium/make.scm
rename to src/planetarium/mit-make.scm

diff --git a/src/planetarium/snapshot.scm b/src/planetarium/mit-snapshot.scm
similarity index 100%
rename from src/planetarium/snapshot.scm
rename to src/planetarium/mit-snapshot.scm

diff --git a/src/planetarium/planetarium.pkg b/src/planetarium/mit.pkg
similarity index 100%
rename from src/planetarium/planetarium.pkg
rename to src/planetarium/mit.pkg