Adjustments for Windows build with MSVC2019 (VC 16.10.31419.357)

1. removed some duplicate symbol linker error
2. removed many compiler warnings (mainly size_t/int compatibility)
3. consistent definition of db::pcell_id_type
4. removed UTF-8 character codes from string constants
5. float constants for float arguments
6. timeout in tlHttp when no openssl lib is found (instead of stalling
   app)

src/db/unit_tests/dbLayoutToNetlistReaderTests.cc

@@ -238,6 +238,8 @@ TEST(1_ReaderBasic)
 
 TEST(1b_ReaderBasicShort)
 {
+  EXPECT_EQ (true, true);   //  removes "unreferenced _this" compiler warning
+
   db::LayoutToNetlist l2n;
 
   std::string in_path = tl::combine_path (tl::combine_path (tl::testdata (), "algo"), "l2n_reader_in_s.txt");