[O] [bug] broken file links

[Samuel Wales]

some file links are broken in maint that used to work.

ebbc675bd9890c451ad01910fa2625fa78baac9b is the first bad commit
Date:   2016-11-13 10:58:23 +0100

the links are like this.

  * 
[[file:/home/whatever/myfile.org::*%5B2016-12-22%20Thu%2011:55%5D%20asdfasdf][{2016-12-22
Thu 11:55} asdfasdf]]

the original is like this.

  * CONVERSATION [2016-12-22 Thu 11:55] asdfasdf

if you follow, you get a hang.