Release 0.7.5 "Perfect Joy" - Polynomials and symbolic rewrites

This release contains a lot of groundwork in preparation for future work on symbolic expressions, symbolic solving and symbolic integration, as well as to improve compatibility with HP calculators. In particular, rewrite has been replaced with the HP equivalents, ↑Match and ↓Match, allowing top-down and bottom-up replacement, as well as support for conditions. Also, these commands return the number of replacements performed instead of just 0 or 1.

The other major user-visible new feature is the addition of a polynomials data type, which does not exist on HP calculators, exposing polynomial features in a way that is more consistent with the spirit of RPL. For example, Euclidean division of polynomials can be achieved using the regular / operation on polynomials instead of requiring a dedicated DIV2 command.

New features

• Support for polynomials as a data type, including Euclidean division
• Arithmetic operations on polynomials, including sq and cubed
• Conversion functions →Poly and Poly→ to convert to and from polynomials
• Optional case-sensitive symbol matching
• Algebra configuration directory (like CASDIR on HP calculators)
• rewrites: Replace rewrite command with HP-compatible ↑Match and ↓Match
• rewrites: Add ExplicitWildcards option to match HP syntax (&A)
• rewrites: Add rules to expand powers
• rewrites: Add support for conditions when matching patterns
• rewrites: Add support for step-by-step rewrites
• rewrites: Add support for bottom-up rewrites
• flags: Purge now resets system flags to default value

Bug fixes

• editor: Fix unresponsive keys after using EXIT key while searching
• complex: Avoid emitting syntax errors while parsing
• rewrites: Avoid potential garbage collection corruption problem
• rewrites: Disable auto-simplification during rewrites
• rewrites: Factor out rewrite loop
• expressions: Encode expressions with type ID >= 128 correctly
• arithmetic: Add space around mod and rem in rendering
• graph: Do not add parentheses for X*(Y/Z)
• functions: Make percentage operations binary functions
• functions: Turn min and max into algebraic functions
• cycle: For expressions, cycle graphic/text rendering correctly
• menus: Replace EquationsMenu with ExpressionMenu in other menus
• ui: Insert space when inserting array inside function

Improvements

• menus: Updates to PolynomialMenu to enter polynomials and for conversions
• menus: Add product and sum to symbolic and algebra menus
• menus: Make ToolsMenu select SymbolicMenu for symbols
• expressions: Reorganize the code for rewrites
• rewrites: Add recorders for rewrites that are actually done
• tests: Some adjustments on color images
• rewrites: Convert algebraics into expression as needed
• complex: Parse 3i and i3 in addition to i
• tests: Add support for more characters
• simulator: Separator color and dm32 support
• graph: Add space when rendering simple function
• keyboard: Updated SVG files with latest menu labeling changes