directory re-organization (keeps the old build system)

there is no internal modification of any file in this commit

files are moved into directories according to established standards in
sourcecode distribution; these directories contain:

 src - Files that are used in constructing the executable binaries,
       but are not installed.

 doc - Files in HTML and text format that document usage, quirks of
       the implementation, and contributor checklists.

 locale - Files that contain human language translation of strings
          used in the program

 contrib - Files contributed from distributions or other third party
 	   implementing scripts and auxiliary programs

doc/coding.txt

@@ -0,0 +1,41 @@
+Please be consistent with the existing coding style.
+
+Block style:
+
+bool Function(char* psz, int n)
+{
+    // Comment summarising what this section of code does
+    for (int i = 0; i < n; i++)
+    {
+        // When something fails, return early
+        if (!Something())
+            return false;
+        ...
+    }
+
+    // Success return is usually at the end
+    return true;
+}
+
+- ANSI/Allman block style
+- 4 space indenting, no tabs
+- No extra spaces inside parenthesis; please don't do ( this )
+- No space after function names, one space after if, for and while
+
+Variable names begin with the type in lowercase, like nSomeVariable.
+Please don't put the first word of the variable name in lowercase like
+someVariable.
+
+Common types:
+n       integer number: short, unsigned short, int, unsigned int,
+            int64, uint64, sometimes char if used as a number
+d       double, float
+f       flag
+hash    uint256
+p       pointer or array, one p for each level of indirection
+psz     pointer to null terminated string
+str     string object
+v       vector or similar list objects
+map     map or multimap
+set     set or multiset
+bn      CBigNum