intial checkin
Rename, rewrite, and reformat all introductory documentation.
Among other things, translate it to GitHub-flavored Markdown.

* README.txt: Move content to...

* README.md: ...here, and rewrite.

* INSTALL.txt: Rename to...

* INSTALL.md: ...here, and rewrite.

* SOLR-INSTALL.txt: Rename to...

* SOLR-INSTALL.md: ...here, and rewrite.

* License.txt, AGPL-License.txt: Remove these in favor of...

* LICENSE.md: ...this new file.  Put text of AGPL-3.0 here.

* documentation/README.txt: Remove; was redundant with top-level README.md.

* software/README, source/database/README.txt: Remove these empty files.
Fix copyright headers for 1129 Checkbook-specific source files.
Add copyright headers to 19 Checkbook-specific SQL files.
Merge pull request #1 from OpenTechStrategies/master

Rename, rewrite, and reformat all introductory documentation.
Merge pull request #2 from OpenTechStrategies/license-header-fixes

License header fixes
Merge pull request #3 from OpenTechStrategies/copyright-headers-for-sql-files

Add copyright headers to Checkbook-specific SQL files.
latest changes
Modified the ETL folder path in the doc
removed duplicates
Merge branch 'master' of github.com:NYCComptroller/Checkbook
merge code
latest drupal dump
removed files
payroll test data changes
merge
Merge branch 'master' of github.com:NYCComptroller/Checkbook
merge
* INSTALL.md: Add "Introduction" section, giving overview of status.
more merges