add license file; fix header comments of SQL files

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT) 
+
+Copyright (C) 2020 team@functionalconcepts.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pgsql/geostore/tables.sql

@@ -1,4 +1,4 @@
--- steg/sql/tgeo.sql
+-- geostore/tables.sql
 
 set search_path to generic, public;
 
@@ -91,3 +91,4 @@ create index fki_attr_item on geoattrs using btree (item);
 create index fki_attr_prop on geoattrs using btree (property);
 create index idx_attr_txtv on geoattrs using btree (property, txtvalue);
 create index idx_attr_intv on geoattrs using btree (property, intvalue);
+

pgsql/geostore/views.sql

@@ -1,4 +1,4 @@
--- steg/sql/vgeo.sql
+-- geostore/views.sql
 
 set search_path to generic, public;