Bump version number to 1.2.0-development; fix ordering and formatting of spec entries in schema table; adjust format of dataTypes appendix table

[sstucker]

Schema table order did not match the table of contents of the spec. Also bumping the vnum in the beginning of the document to reflect the new version number

The measurementList/measurementLists are much like 2D/3D probe geometries in that only one is required--I have edited the schema to reflect this.

Edit: I see #147 also bumps version. I think both of these are ready for merge.

[dboas]

@samuelpowell
This looks good to me. Stephen's changes to the measurementList and measurementLists all looks good. It doesn't capture clearly that the requirement is that only one should be present. But we are still discussing the best solution for that in #155.
Should we get that all resolved in this PR? Or accept this PR and then further clarify it later.
Seems best to resolve it all in this first PR.

Also, we just bumped the version number in PR #147. But I see under file changes for this PR that it still reflects the old version number, which was there when this PR was first made. Seems odd to me that the file changes is not reflecting the current state of the master branch.

[samuelpowell]

@dboas this PR is specifically to fix the schema table, so I think it's fine to merge and then deal with the specifics of the content in #155 as required.

(Regarding the version number, that is normal - the work in this PR was banched from master before those changes were made, and unless they are merged into this branch, or this branch is rebased onto the latest master commit, the new changes will not be seen. It will all be resolved, or not, when this is merged)