Fix irpf90_indent now does not produce white space lines

Fix C preprocessor macros are now never indented
Fix !$omp directive are now never indeted

src/irpf90_indent.py

@@ -106,6 +106,14 @@ class Grep(object):
   def declaration(self,string):
     return re.match(self.re_declaration,string) is not None
 
+  re_preprocessor = re.compile(r"^\s*#.*$")
+  def preprocessor(self,string):
+    return re.match(self.re_preprocessor,string) is not None
+
+  re_omppragma = re.compile(r"^\s*!\$omp\s.*$")
+  def omppragma(self,string):
+    return re.match(self.re_omppragma,string) is not None
+
 grep = Grep()
 
 class indent(object):
@@ -167,6 +175,19 @@ class indent(object):
     for i in range(len(self.text)):
       prevline = line
       line = self.text[i].strip()
+
+      if line == "":
+        print("")
+        continue
+
+      if grep.preprocessor(line):
+        print(line.lstrip())
+        continue
+
+      if grep.omppragma(line):
+        print(line.lstrip())
+        continue
+
       if grep.continuation(line):
         line = self.format_continuation(line,k)