show progress bar in loadjson

git-svn-id: http://svn.code.sf.net/p/iso2mesh/code/trunk/jsonlab@452 786e58fb-9377-0410-9ff7-e4ac0ac0635c
tag version 1.0-RC2

git-svn-id: http://svn.code.sf.net/p/iso2mesh/code/trunk/jsonlab@453 786e58fb-9377-0410-9ff7-e4ac0ac0635c