lexer now accepts really really large numbers :)

Rev: src/block_alloc.h:1.13
Rev: src/configure.in:1.325
Rev: src/language.yacc:1.128
Rev: src/las.c:1.93
Rev: src/las.h:1.22
Rev: src/lexer.h:1.8
Rev: src/modules/Gmp/configure.in:1.8
Rev: src/opcodes.c:1.48
Rev: src/pike_memory.c:1.49
Rev: src/pike_memory.h:1.12
Rev: src/stralloc.c:1.70
Rev: src/stralloc.h:1.37