Revert "Deleted very old code that I wrote, which had little functionality and never took off."

This reverts commit a327db3357c1c04b4cbf6cdd12a898083e78a3be.
Moved to the new location

Change-Id: I501c876fb7b57d1b6519c9e8b9a2e4c2e4e24332
Revert "Removed: no serious functionality, not used (closes #2194603)."

This reverts commit 6a71d6348be0f5d014b65bc6118fd6395319b894.
Updates for the CDK 1.5 API

Change-Id: I50f32f5a526015c0e01369808b8704f4bd6967c7
build changes to build the "experimental" module
Restore buildability of Fragment.java

 * add @cdk.module experimental tag

  * import AtomContainer
add IUPACNames_en_US.properties

* (at least until we figure out a better default bundle resource strategy)
look for hydrogen isotope 1, not isotope 11
not sure if this is correct, but use ac instead of molecule local variable

 * gets things to compile at least