TAB-1273: Non-Alphabetical Tables and Lists

I did some lightweight analysis on the tables and lists in the DITA 1.3 Base spec that were:
* sorted alphabetically
* not sorted alphabetically
* "other" -- sorting not relevant
 
Patrick Durusau's feedback that the reading experience of the spec would be enhanced with a higher percentage of sorted tables and lists is correct. The information in the spec with greatest frequency of unsorted tables and lists were:
- DITA markup element tables
- Terminology lists
- Attribute lists
Targeting those lists for alphabetization in the next version of the spec would have a positive effect on readability. That is my recommendation. 

NOTE: Although all the table rows in the 182 Appendix C Content Models are sorted, very few of the comma-separated "contained in" lists are sorted. To some extent, that is a larger readability issue but was outside teh scope of the TAB-1273 feedback. 
part1-base tables           #tables    #sorted    #unsorted    #other
-------------------------- ---------- ---------- ----------- ------------
1.1.x: Intro                    0          0          0          0
2.1.x: Arch Intro              17          2          8          7
3.1/3.2: Base / Topic Ref       0          1          0          5
3.10: Attributes                2          0          0          2
Appendix C: Content Models*   182        182          0          0

* Elements "contained" within content model cells are not sorted.

part1-base lists             #lists     #sorted    #unsorted    #other
-------------------------- ---------- ---------- ----------- ------------
1.1.x: Intro                   7          0          0          7
2.1.x: Arch Intro              9          3          6          0
3.1/3.2: Base / Topic Ref     18          2         15          1
3.10: Attributes              22          6         16          0
Appendix C: Content Models     0          0          0          0

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