Updated build instructions in README.md and moved database info to DATABASE.md

DATABASE.md

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+# Database
+
+You can examine your node's database using [HSQLDB's "sqltool"](http://www.hsqldb.org/doc/2.0/util-guide/sqltool-chapt.html).
+It's a good idea to install "rlwrap" (ReadLine wrapper) too as sqltool doesn't support command history/editing.
+
+Typical command line for sqltool would be:
+`rlwrap java -cp ${HSQLDB_JAR}:${SQLTOOL_JAR} org.hsqldb.cmdline.SqlTool --rcFile=${SQLTOOL_RC} qora`
+
+`${HSQLDB_JAR}` should be set with pathname where Maven downloaded hsqldb, 
+typically `${HOME}/.m2/repository/org/hsqldb/hsqldb/2.5.0/hsqldb-2.5.0.jar`
+
+`${SQLTOOL_JAR}` should be set with pathname where Maven downloaded sqltool,
+typically  `${HOME}/.m2/repository/org/hsqldb/sqltool/2.5.0/sqltool-2.5.0.jar`
+
+`${SQLTOOL_RC}` should be set with pathname of a text file describing HSQLDB databases, 
+e.g. `${HOME}/.sqltool.rc`, with contents like:
+
+```
+urlid qortal
+url jdbc:hsqldb:file:db/blockchain
+username SA
+password
+```
+Above `url` component `file:db/blockchain` assumes you will call `sqltool` from directory containing `db/`.
+
+Another idea is to assign a shell alias in your `.bashrc` like:
+```
+export HSQLDB_JAR=${HOME}/.m2/repository/org/hsqldb/hsqldb/2.5.0/hsqldb-2.5.0.jar
+export SQLTOOL_JAR=${HOME}/.m2/repository/org/hsqldb/sqltool/2.5.0/sqltool-2.5.0.jar
+alias sqltool='rlwrap java -cp ${HSQLDB_JAR}:${SQLTOOL_JAR} org.hsqldb.cmdline.SqlTool --rcFile=${SQLTOOL_RC}'
+```
+So you can simply type: `sqltool qortal`
+
+Don't forget to use `SHUTDOWN;` before exiting sqltool so that database files are closed cleanly.