Log Message:
link-grammar: update to 5.9.1

Version 5.9.1 (28 April 2021)
 * Fix build break when SQLite3 is not installed. #1195

Version 5.9.0 (25 April 2021)
 * Use #define for custom configuration in dictionaries. #1128
 * Panic-mode fixes and extensions. In link-parser see !help panic_variables.
 * English dict: fix silly mistake with "I love cats and dogs".
 * Disable maintainer-mode in `configure.ac`.
 * Fix very rare crash/corruption introduced in v.5.8.1 #1142
 * English dict: fix problems with "just/only".
 * English dict: work on hesitation markers.
 * Fix multi-threading mem-leak. #1149
 * Provide emscripten javascript wrapper for the command-line parser.
 * Public API shared library entry points exported automatically. #1182
 * Provide bindings for the Vala programming language.
 * Increase number of allowed idiom expressions. #1187
 * Replace O(n^2) idiom loading algo by an O(n log n) algo. #1194
 * Disable SAT solver by default.
 * New tool: Sentence generator! This is an experimental prototype.