add "--detect-all" option to use sqlmap for detecting all SQL injections in multi-targets

I used sqlmap in multi-targets mode (-m) to scan an entire site but tests stopped on the first url with SQL injection.
It is why I added "--detect-all" option.
Now we can scan all urls given with '-m' option or discovered by crawling without the tests stopping on the first SQL injection found. The output with "--detect-all" option has been a little modified, the url of the vulnerable url is printed on the report (also when --verbose=0)