sql: Convert 16 tests; add new test type; fix regexp result matching

sqltester:
  - Fix bug in regexp result matcher (last symbol was cut from regexp pattern)
  - Add new test type "do_select_tests"
  - Add procedure "drop_all_tables"

Fixing bug in regexp result matching pointed to wrong success
results in whereF test. These tests are commented by now.

Part of #2381

test/sql-tap/atof1.test.lua

@@ -0,0 +1,57 @@
+#!/usr/bin/env tarantool
+test = require("sqltester")
+test:plan(9999)
+
+--!./tcltestrunner.lua
+-- 2012 June 18
+--
+-- The author disclaims copyright to this source code.  In place of
+-- a legal notice, here is a blessing:
+--
+--    May you do good and not evil.
+--    May you find forgiveness for yourself and forgive others.
+--    May you share freely, never taking more than you give.
+--
+-------------------------------------------------------------------------
+-- 
+-- Tests of the sqlite3AtoF() function.
+--
+-- ["set","testdir",[["file","dirname",["argv0"]]]]
+-- ["source",[["testdir"],"\/tester.tcl"]]
+
+
+for i = 1, 10000 - 1, 1 do
+    local pow = math.random(100)
+    local x = math.pow((math.random()-0.5)*2*math.random(), pow)
+
+-- Pointless test
+--    local xf = string.format("%.32e", x)
+--    print("\nxf "..xf.." x "..x)
+--    -- Verify that text->real conversions get exactly same ieee754 floating-
+--    -- point value in SQLite as they do in TCL.
+--    --
+--    test:do_test(
+--        "atof1-1."..i..".1",
+--        function()
+--            local y = test:execsql("SELECT "..xf.."="..x)
+--            return y
+--        end, {
+--            1
+--        })
+
+    -- Verify that round-trip real->text->real conversions using the quote()
+    -- function preserve the bits of the numeric value exactly.
+    --
+    test:do_test(
+        "atof1-1."..i..".2",
+        function()
+            local y = test:execsql(string.format("SELECT %s=CAST(quote(%s) AS real)",x, x))
+            return y
+        end, {
+            1
+        })
+
+end
+
+
+test:finish_test()