added schema design; added legal info

CONTRIBUTING

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+Everyone is welcome to contribute!
+
+
+Coding Standards
+
+The software is in Python (Python 3) and/or C (C11).
+Please take care to maintain the coding standards
+of already existing code.
+
+[TODO: mention tool setup for automatic checking of coding standards;
+ pylint and indent configuration]
+
+
+License and IP
+
+The software is released under a BSD-2-Clause license.
+The complete text of the license is in the file named "LICENSE"
+on the top-level directory.
+
+There is no copyright assignement, nor a CLA for participating
+on this project.  Each contriburor maintains authorship of their code.
+
+In case you want to contribute code by someone else,
+please put it into a separate directory under the "3rd_party" tree.

LICENSE

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+Copyright (C) 2017 Alexios Zavras and others
+
+Redistribution and use in source and binary forms,
+with or without modification, are permitted
+provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+

Notes/commands

@@ -1,7 +1,7 @@
 Commands
 --------
 
-The exact set of commands will be determined later.
+The exact set of commands is a work in progress.
 
 However, the following should give a reasonable first approach.
 

Notes/schema

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+
+               +------------+
+ +--------+    |  scanned   |                     +-----------------+
+ |  file  |    | id         |    +-----------+    |  scanrun_X_tag  |
+ | id     |--->| file_id    |    |  scanrun  |    | id              |
+ | name   |    | scanrun_id |<---| id        |--->| scanrun_id      |
+ | path   |    | hash_id    |<-\ | when      |    | tag_id          |<--\
+ | size   |    +------------+  | | args      |    +-----------------+   |
+ +--------+                    | +-----------+              +-------+   |
+                               |                            |  tag  |   |
+                               | +-------------+            | id    |---/
+               +------------+  | |  hash       |            | name  |
+               |  hashtype  |  \-| id          |            +-------+
+               | id         |--->| hashtype_id |
+               | name       |    +-------------+
+               | size       |
+               +------------+                     |
+                                                  |
+ +--------------+                                 |
+ |  scanerror   |    -----------------------------/
+ | id           |   /
+ | scanrun_id   |<-/  +-------------+
+ | path         |     |  errortype  |
+ | errortype_id |<--- | id          |
+ | details      |     | name        |
+ +--------------+     +-------------+
+
+ +--------------+
+ |  db_version  |
+ | id           |
+ | valid_from   |
+ | valid_till   |
+ +--------------+
+