Initial version of handling missing ACE data
Add robust bad ACE data handling and test scenarios

Instead of dropping bad ACE data at the point of reading in
values, leave the bad values there (as indicated by a negative
value) and do downstream handling of bad values.

Indicate bad or N/A values with bold red text in the state table.
If there is no average P3 from MTA then use 0.0 for fluence but
show fluence as red.
Merge pull request #13 from sot/missing-ace

Robust handling of missing ACE data in timeline