clone: remove "file://" before making the path absolute

This avoids writing bogus paths to .hgrc.  Fixes issue695.

mercurial/hg.py

@@ -141,7 +141,7 b' def clone(ui, source, dest=None, pull=Fa'
     abspath = origsource
     copy = False
     if src_repo.local() and islocal(dest):
-        abspath = os.path.abspath(origsource)
+        abspath = os.path.abspath(util.drop_scheme('file', origsource))
         copy = not pull and not rev
 
     src_lock, dest_lock = None, None

tests/test-clone

@@ -25,3 +25,11 b' cd ../d'
 hg clone ../a
 cd a
 hg cat a
+
+# check that we drop the file:// from the path before
+# writing the .hgrc
+cd ../..
+hg clone file://a e
+grep 'file:' e/.hg/hgrc
+
+exit 0

tests/test-clone.out

@@ -14,3 +14,4 b' 1 files, 1 changesets, 1 total revisions'
 destination directory: a
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 a
+1 files updated, 0 files merged, 0 files removed, 0 files unresolved