Appendix labels should be removed and added to the beginning of titles

[fred-atherden]

Please move all the content within labels in appendices to the beginning of the title.

For example:

<app id="app1">
<label>Appendix</label>
<title>Simulating the Belgian Childcare Tax Reduction</title>
<sec id="app1-1">

should be changed to

<app id="app1">
<title>Appendix: Simulating the Belgian Childcare Tax Reduction</title>
<sec id="app1-1">

The following files, delivered thus far contain section labels: iijm-00003 ijm-00005 ijm-00009 ijm-00013 ijm-00021 ijm-00027 ijm-00035 ijm-00042 ijm-00045 ijm-00046 ijm-00053 ijm-00089 ijm-00105