Initial commit: nimforum with BaraDB backend

- Replaced SQLite with BaraDB via TCP wire protocol
- Added baradb_client.nim and baradb_sqlite.nim adapter
- Renamed SQL keywords: status->usrStatus, key->sessionKey, like->postLike
- Added NOW() support for datetime defaults
- Switched Jester to asynchttpserver (-d:useStdLib) to avoid thread/GC issues
- Frontend built and favicon added

public/search-help.rst

@@ -0,0 +1,35 @@
+Full-text search for Nim forum
+==============================
+
+Syntax (using *SQLite* dll compiled without *Enhanced Query Syntax* support):
+-----------------------------------------------------------------------------
+
+- Only alphanumeric characters are searched.
+- Only full words and words beginnings (e.g. ``Nim*`` for both ``Nimrod`` and ``Nim``) are searched
+- All words are joined with implicit **AND** operator; there's no explicit one
+- There's explicit **OR** operator (upper-case) and it has higher priority
+- Words can be prepended with **-** to be excluded from search
+- No parentheses support
+- Quotes for phrases search, e.g. ``"programming language"``
+- Distances between words/phrases can be specified putting ``NEAR`` or ``NEAR/some_number`` between them
+
+Syntax - differences in *Enhanced Query Syntax* (should be enabled in *SQLite* dll):
+------------------------------------------------------------------------------------
+
+- **AND** and **NOT** logical operators available
+- Precedence of operators is, from highest to lowest: **NOT**, **AND**, **OR**
+- Parentheses for grouping are supported
+
+Where search is performed:
+--------------------------
+
+- **Threads' titles** - these results are outputed first
+- **Posts' titles** - middle precedence
+- **Posts' contents** - the latest
+
+How results are shown:
+----------------------
+
+- All results are ordered by date (posts' edits don't affect)
+- Matched tokens in text are marked (bold or dotted underline)
+- Threads title is the link to the thread and posts title is the link to the post