TreeCopy History
---------------- 
v1.30         1992 - Can copy all DFS directories.
v1.33  03-Mar-1992 - Can copy HADFS files manually if no OSFIND support.
v1.42
v1.43  21-Feb-2995 - Rewritten to do multiple files per pass. Preserves directory
                     context.
v1.48  17-Sep-1996 - Reads command-line parameters from keyboard buffer, GetEnv or
                     OSGBPB 9, quit passes command to keyboard buffer.
v1.49  21-Nov-1996 - Transfer buffer rounded to &xxxx00 bytes long, can also read
                     command line from MCode buffer at &780
v1.49a 21-Nov-1996
v1.49b 13-Aug-1998 - Removed reading command line from keyboard and input buffer.
v1.50  14-Aug-1998 - Reads command line from string buffer on 6502 or Z80 instead of
                     keyboard buffer. Error handler starts before user prompts so
                     program can quit. Quit clears string buffer to CHR$13. Reads and
                     writes full info on NFS objects.
v1.51  04-Jul-2004 - If source or dest is ADFS, selects with *MOUNT, remounts after
                     Pause. Fixed missing INSTR from FNpath introduced at v1.50 to
                     strip spaces from disk name.
v1.52  23-May-2005 - memory bugfix - buffer 256 bytes longer than actually used.
v1.55  15-Aug-2006 - -? command option, fx1 set on exit. Startup message displayed
                     after options processed.
v1.56  15-Aug-2006 - *Mount on ADFS ensures files left open. Doesn't write NFS info if
                     none read.
v1.57  15-Jan-2007 - GetEnv works on ARM CoPro. DFS attrs converted to/from standard
                     form. Standard FNfs, updated GetEnv.
v1.58  29-Jun-2009 - Recognises DFS-like non-DFS systems, eg RAMFS. Claims less memory
                     from heap in large memory systems (eg ARM)
v1.59  25-Jan-2012 - Full dates copied when present, relocates above BASIC on
                     6502-Tube Skips files starting with ".". When creating initial
                     output file for OSGBPB uses maximum 4M length, sets initial
                     access to WR/wr. Prepends "@." on files when reading to deal with
                     names like eg "-dash-". Creating directories displays "CDir..."
                     Note: file servers will time out if trying to copy huge files, eg
                     greater than 1M or so. Acorn file servers give error if writing
                     load/exec of directories, so if creating a directory on NetFS
                     only sets attrs. Creating directories on NetFS uses *CDIR name
                     255. X%/Y% restored after error handler.
v1.60  05-Feb-2016 - (F)orce option, Overwrite Y/N/A, source path printed, OSGBPB
                     transfer checks for locked file, -debug option added.
v1.60a 10-Feb-2016 - Disk full aborts, all,sub,ex options work.
                     Bug: PROCGBPB Skip/Abort doesn't work. CLOSE# tried to close
                     closed file.
v1.60b 12-Feb-2016 - PROCGBPB unlocks DFS files. GBPB Skip/Abort CLOSE only closes
                     dest file.
v1.61  12-Feb-2016 - Remove FNpath/FNlibpath usage. Experiment: single-file copying.
v1.61a 22-Jun-2016 - Fix reading access from DFS, writing to non-HADFS
v1.62  08-Feb-2017 - GetEnv updated to run on ARM BASIC 1.00 with no SYS command.
                     'Save' and 'Copy' added to progress dialogue. Removed usage of
                     *CDIR name 255 as inconsistant support on servers.
v1.63 18-Jan-2018 - Added Update option, only copies files if metadata different.
                     Has to do unbuffered single file copying to work correctly.