See #245

This tests for 31adcd34

There was some "return 1". Now that exit code is checked, this would
have triggered an error

hopefully the last time..

[makedoc]

asin/acos/atan were computed out of range with results depending on
the machine (failing on travis-ci)

(see a7ed0531)

This reverts commit 1f468153.

Notice that there are a few separate regtests for lepton

This is just to check if lepton gives same results as matheval

These tests were marked as needing matheval incorrectly

These tests were marked as needing matheval incorrectly

- added FMT keyword
- added regtest

added a two regtests
close #243