templatekw: rename peerpaths to peerurls per naming convention (BC) Since each element is called as "url", the template keyword should be named as "<whatever>urls". {peerurls} is now stabilized.

templatekw: make experimental {peerpaths} return a single-level dict (BC) This was planned as in c0d8de2724ce, "{peerpaths.default.pushurl} will be translated to peerpaths['default'].makemap()['pushurl'], which means {peerpaths} should be a single-level dict and sub-options should be makemap()-ed."

templatekw: fix scope of peerpath url bound to generator I had to explicitly bind 'd' to the generator. Otherwise, the last 'd' would be used.

templater: extend dot operator as a short for get(dict, key)

templater: add dot operator to easily access a sub item This and the next patch will allow us to access a deeply-nested item by foo.bar.baz syntax.

templater: wrap get/min/max result so map operation can apply to element See the test for usage example. wraphybridvalue() takes a key/value pair because a hybrid dict passes a key to its makemap() function. Since makemap() of showmanifest() doesn't need a key, it's set to None.

dispatch: move initialization of sys.std* files I'll add another Python 3 hack.

py3: work around the scope of exception variable in dispatch.run() https://stackoverflow.com/questions/29268892/