add bug report

doc/bugs/git_annex_map_has_problems_with_urls_containing___126__.mdwn

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+I discovered a problem with `git annex map` and relative urls containing `~`.
+In this case i have a remote `noam` configured with the the following urls:
+
+    zsh» git remote show noam | head -3
+    * remote noam
+      Fetch URL: noam:bare-annex
+      Push  URL: noam:bare-annex
+
+If i try to run `git annex map` i get the following error:
+
+    zsh» git annex map
+    map /home/esc/annex ok
+    map noam (sshing...)
+    bash: line 0: cd: /~/bare-annex/: No such file or directory
+    Command ssh ["noam","cd '/~/bare-annex/' && git config --list"] failed; exit code 1
+    (sshing...)
+    ok
+
+      running: dot -Tx11 map.dot
+
+    ok
+
+If i run the failing command manually, i get:
+
+    zsh» ssh noam "cd ~/bare-annex && git config --list"
+    core.repositoryformatversion=0
+    core.filemode=true
+    core.bare=true
+    annex.uuid=f267f55c-0732-11e1-a93b-93119f9aaf54
+    annex.version=3
+
+Also i can change the remote url to an absolute one, in which case `git annex
+map` works too:
+
+    zsh» git remote set-url noam noam:/home/esc/bare-annex
+    zsh» git annex map
+    map /home/esc/annex ok
+    map noam (sshing...)
+    ok
+
+      running: dot -Tx11 map.dot
+
+    ok
+