mq: don't suppress patch tracebacks when applying patches

test-setdiscovery.t: portability fix The output of 'wc -c' is prefixed with spaces when using BSD wc.

keyword: use wopener(..., atomictemp=True) to overwrite

share: drop unused import

merge with stable

test: test unshare command

hgext: introduce unshare command

hg: extract copying the store out of clone

url: Remove the proxy env variables only when needed (issue2451) This is an attempt to fix issue 2451 and its duplicates (2599 and 2949, AFAIK). Its main idea is that it is only necessary to clean the proxy environment variables *when* http_proxy is set in the config file (since it takes precedence over the environment variables). Otherwise, hg shouldn't bother with them, since they will most likely be used to reach the server.

util: improve finding of hgexecutable check the module __main__ before looking on the default path