Release 0.9.17 - Rational approximation, indexing, Android fixes

This incremental release delivers new features and fixes a number of bugs.

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New features

• Add →Qπ command for rational approximation with π, √n, ln(n) and e
• Apply →Q and →Qπ to numbers in expressions
• Add array/list indexing support in algebraic expressions e.g. 'L(1)'
• Add ability to Store / Copy to L(1)
• Add "real" ConstantName and ConstantValue commands

Bug fixes

• Fix parentheses around exponents in graph rendering of '(a+b)^(c+d)'
• Fix label for ToRelativeUncertainty, →RelRnd instead of →RelUnc
• Fix command alias mapping for RNrm
• Improve parsing of implicit multiplication for a number of edge cases
• Fix utf8_next for garbage bytes following ASCII characters
• Fix unsatisfied symbol errors with gcc/emcc in the WASM build
• Save Android system state when app is suspended or hidden
• Ensure Android help resources are extracted and available at runtime
• Restore image testing functionality in the test framework
• Updated test images that had become obsolete
• Report errors when saving reference files in tests
• Avoid stack corruption / crash when parsing malformed help index
• Fix computation of DFC(2.3)
• Fix null-pointer crash if the multiple equation solver fails

Enhancements

• Constrain →Q and →Qπ behavior to FIX/SCI/ENG setting (like HPs)
• Minor optimization for program::run
• Save about 3.4K of RAM on physical devices
• Speed up test runs while increasing default wait time for stability
• Documentation cleanup and additions, add more RPL examples
• Add clear build-time error message when a help topic exceeds 80 characters
• Add demo for interactive menu use
• Optimize away redundant argument checking
• Documentation for DCF and DCF2F

Signed-off-by: Christophe de Dinechin christophe@dinechin.org