Release 0.7.15 "Teaching" - Bug fixes notably on iOS

[c3d]

This release mostly focuses on issues exposed by the iOS releases.

Bug fixes

• ios: Fix a screen refresh bug delaying the display of computation results
• ios: Increase user-accesssible memory for DB50X to match the DM32
• files: Avoid opening two files when a loaded file contains units/constants
• units: Restrict unit expressions further, e.g. forbid 1_km^s
• build: Do not add unwanted macOS-specific files in release tar files
• build: Remove irrelevant help file from releae tar file
• constants: Fix numerical value for G constant
• tests: Rename M demo helper to D, since we use M in symbolic tests
• makefile: Add mv echo to targets doing image comparison
• units: Use pi constant in definition of radians unit
• parser: Detect syntax error on (inv(x)) in non-expression mode
• units: Avoid infinite loop for bad unit exponents
• files: Avoid crash in file_closer if file does not exist
• tests: Add DMS/HMS operations to math demo
• tests: Add keyboard shortcuts to launch the demos

Full Changelog: v0.7.14...v0.7.15

---

This discussion was created from the release Release 0.7.15 "Teaching" - Bug fixes notably on iOS.