Implement Double-Number and String word sets, fix memory panics
Double-Number (19 words): D+ D- DNEGATE DABS D2* D2/ D0= D0< D= D< DU<
DMAX DMIN D>S M+ M*/ D. D.R 2ROT 2CONSTANT 2VARIABLE 2VALUE 2LITERAL
Double-number literal parsing (tokens ending with '.')
String (5 words): COMPARE SEARCH /STRING BLANK -TRAILING SLITERAL
Fix all memory access panics with bounds checking throughout host functions.
8 word sets at 100%: Core, Core Ext, Exception, Double, String,
Search-Order, Memory-Allocation, Programming-Tools
ok2
dd389c6a3d