HRDIC data loader not working for davis 10 files

[mikesmic]

Issues to fix for davis 10 format

• [ ] Coordinate values are formatted as floats (even for int values)
• [ ] Coordinate values are not necessarily integers (Only half integers because of odd sized integration windows?)
• [ ] Coordinate values can -ve
• [ ] Possibly different units for coordinates and displacements, assumed to be the same when calculating strain currently