Minor bug fix

Fixed bug where cells where compared to subfault locations using subfault physical locations instead of computational locations. This change will only affect runs with multiple subfaults with spatially varying slip. For such fault setups included here, this change does not affect the outcomes.

Updated README files and minor bug fix

• Updated README files to include appropriate documentation links
• Added buffer in b4step when checking if computational cell lies on the fault (avoids potential issue with a grid cell at edge of fault being assigned zero slip due to round-off issues)

v1.0.0

Update README.md