refactor: remove support for postgresql < 8.2

[jorsol]

Refactor to support PostgreSQL 8.2+.
Since unit test are not designed to run under pg8.2 (yet) the driver "should" work under 8.2 but I can't guarantee it.

If there are community members that can help the certification with pg8.2 and/or pg8.3 or another variant that is based on those versions, it would be great.

[codecov-io]

Current coverage is 63.20% (diff: 51.15%)

Merging #661 into master will increase coverage by 1.21%

@@             master       #661   diff @@
==========================================
  Files           150        150          
  Lines         15145      14694   -451   
  Methods           0          0          
  Messages          0          0          
  Branches       3045       2906   -139   
==========================================
- Hits           9388       9287   -101   
+ Misses         4510       4216   -294   
+ Partials       1247       1191    -56   

Powered by Codecov. Last update b4604cd...22aa490

[vlsi]

This seems to include too much reformatting that does not relate with "drop <8.2" subject. Please avoid doing reformat for little reason.

[vlsi]

E.g.

PgDatabaseMetaData

   public String getNumericFunctions() throws SQLException {
-    return EscapedFunctions.ABS + ',' + EscapedFunctions.ACOS + ',' + EscapedFunctions.ASIN + ','
-        + EscapedFunctions.ATAN + ',' + EscapedFunctions.ATAN2 + ',' + EscapedFunctions.CEILING
-        + ',' + EscapedFunctions.COS + ',' + EscapedFunctions.COT + ',' + EscapedFunctions.DEGREES
-        + ',' + EscapedFunctions.EXP + ',' + EscapedFunctions.FLOOR + ',' + EscapedFunctions.LOG
-        + ',' + EscapedFunctions.LOG10 + ',' + EscapedFunctions.MOD + ',' + EscapedFunctions.PI
-        + ',' + EscapedFunctions.POWER + ',' + EscapedFunctions.RADIANS + ','
-        + EscapedFunctions.ROUND + ',' + EscapedFunctions.SIGN + ',' + EscapedFunctions.SIN + ','
-        + EscapedFunctions.SQRT + ',' + EscapedFunctions.TAN + ',' + EscapedFunctions.TRUNCATE;
-
+    return EscapedFunctions.ABS + ',' + EscapedFunctions.ACOS + ','
+           + EscapedFunctions.ASIN + ',' + EscapedFunctions.ATAN + ','
+           + EscapedFunctions.ATAN2 + ',' + EscapedFunctions.CEILING + ','
+           + EscapedFunctions.COS + ',' + EscapedFunctions.COT + ','
+           + EscapedFunctions.DEGREES + ',' + EscapedFunctions.EXP + ','
+           + EscapedFunctions.FLOOR + ',' + EscapedFunctions.LOG + ','
+           + EscapedFunctions.LOG10 + ',' + EscapedFunctions.MOD + ','
+           + EscapedFunctions.PI + ',' + EscapedFunctions.POWER + ','
+           + EscapedFunctions.RADIANS + ',' + EscapedFunctions.ROUND + ','
+           + EscapedFunctions.SIGN + ',' + EscapedFunctions.SIN + ','
+           + EscapedFunctions.SQRT + ',' + EscapedFunctions.TAN + ','
+           + EscapedFunctions.TRUNCATE;
   }

[vlsi]

@jorsol , I'll test #661 and #659 together in the #659

[jorsol]

@vlsi I have removed some formatting to facilitate review, you can test 22aa490 on #659

[vlsi]

Great. Thank you.
The leftover changes should probably be considered for inclusion as well.