v2.19pre2

Bugfixes:

• format mz: stack segment was never written - a fault if it isn't
  located at the end of the binary; see stack1.asm.
• format mz,pe: start offset for first segment may have resulted in
  an invalid binary; see org1.asm & org2.asm.
• fastcall 32-bit (MS style): registers may have hold float arguments.
• no 'implicit far jmp/call to near label' error in pass one; see
  group7.asm.
• option -D: accept white spaces if option is enclosed in double quotes
  ( Masm compatible ).
• subtraction of 2 labels may have caused error "constant value too large";
  see minus1.asm.
• if .model wasn't flat, but segments with flat attribute existed, they
  may not have been listed in symbol table.
• regression in v2.05-v2.18, DUP operator: if an undefined symbol was
  contained in first operand, error message may have been omitted; see
  struct43.asm.
• local labels were accepted by PUBLIC directive without -Zm being set;
  see public3.asm.
• omf format: incorrect special handling of assembly-time variable fixups
  removed; see label9.asm.

Other changes:

• write listing reworked.
• option -pe: add segments with combine type stack - they may contain
  initialized data.
• JWasmr.exe: option -Sz removed.
• PUSHW will emit warning "magnitude of offset exceeds 16-bit" if
  operand is a 32-bit offset.
• using 'option oldmacros' will cause a warning only.
• option -pe: info section ".drectve" will be scanned and some linker
  options are recognized and handled.
• PUBLIC directive extended to allow setting the export attribute.
• PAGE directive: syntax check added.
• .model flat: ensure variables in 16-bit segments can be accessed
  directly if segment register is assumed flat ( Masm compatible );
  see flat2.asm.