Replace pandoc-based md-to-man conversion with a custom python script.

Hopefully this will appease the people who can't install pandoc on MacOS.

Documentation/t/testitem.md

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+% redo(1) Redo %VERSION%
+% Avery Pennarun <apenwarr@gmail.com>
+% %DATE%
+
+# NAME
+
+redo-always - mark the current target as always needing to be rebuilt
+
+# SYNOPSIS
+
+redo-always
+
+
+# DESCRIPTION
+
+Normally redo-always is run from a .do file that has been
+executed by `redo`(1).  See `redo`(1) for more details.
+
+This is a "quoted string."
+
+"entirely quoted"
+
+.starting with dot
+
+I'm a \big \\backslasher!
+
+This **line** has _multiple_ `formats`(interspersed) *with* each _other_
+and *here is a multi
+line italic.*
+
+This line has an & and a < and a >.
+
+- "line starting with quoted"
+
+        Here's some code
+           with indentation
+              yay! (a \backslash and <brackets>)
+              "foo"
+        
+        skipped a line
+           indented
+           
+              another skip
+              
+- -starting with dash
+
+- .starting with dot
+
+chicken
+
+-   list item
+    with more text
+  
+    and even more
+    
+    -   second list
+     	-   third list
+
+wicken
+
+-   list 1a
+-   list 1b
+    -   list 2
+        -   list 3
+
+barf
+          
+First line
+:    definition list.
+     with
+     multiple
+     lines!
+     
+--item=*value*
+:    a description.
+
+`-x`
+:    more stuff.  if you had a lot of text, this is what it
+would look like.  It goes on and on and on.
+
+a line with *altogether* "too much" stuff on it to realistically *make* it in a definition list
+:   and yet, here we are.
+
+
+# SEE ALSO
+
+`redo`(1), `redo-ifcreate`(1), `redo-ifchange`(1), `redo-stamp`(1)