Missing files, fix #82
Fix: [-Wunused-but-set-variable] (comment as usage if commented)
Fix [-Wunused-but-set-variable]
Fix: [-Wreturn-type]
[-Wformat=]
Fix [-Wunused-variable] [-Wparentheses]
Fix [-Wunused-variable] [-Wparentheses]
Fix [-Wunused-variable] [-Wparentheses]
Merge pull request #83 from remicollet/issue-230

Various fix for 2.3.0