Remove number of deprecated parameters/functions/classes [fix #6641]

Fixes #6641

Line numbers as of commit 70de129:

#### Deprecated since 0.11 or before

The following are fixed in this PR:
- [x]  Deprecate precision in favor of accuracy (#395)  --  v0.7.0  
       .\pandas\core\format.py:{2143}
- [x]   Deprecate force_unicode (#2224, #2225)  --  v0.10.0  
        .\pandas\core\format.py:{442, 369}  
        .\pandas\core\frame.py:{1387, 1342, 1283} 
- [x]  Deprecate nanRep in favor of na_rep (#275)  -- v0.5.0  
      .\pandas\core\frame.py:{1285, 1133}  
      .\pandas\core\series.py:{910}
- [x]  Deprecate unique in HDFStore (#3256)  -- v0.11.0  
     .\pandas\io\pytables.py:{691}
- [x]  Deprecate time_rule favor freq (#1042)  -- v0.8.0  
      .\pandas\stats\moments.py:{554}
- [x]  Deprecate inferTimeRule in favor of infer_freq (#391)  -- v0.8.0  
     .\pandas\tseries\frequencies.py:{247}
- [x] Deprecate DateRange in favor of DatetimeIndex (no issue number, commit 6fe2db57)  -- v0.8.0  
      .\pandas\core\daterange.py:{24}  (will be done in #6816)
- [x]  Deprecate 'name' in favor of 'symbols' (no issue, commit b921d1a2)  -- v0.11.0  
     .\pandas\io\data.py:{344}
- [x]  Deprecate offset in favor of freq (no issue, commit 31363905c20)  -- v0.8.0  
     .\pandas\tseries\index.py:{180}

 
##### Deprecated since 0.12 or after

Issue #6581 documents the following for future removal.  **These are not included in this PR**
- [ ]  ~~Deprecate na_last in favor of na_position (#5231, #3917)~~   
     .\pandas\core\series.py:{1770}  
- [ ] ~~Deprecate rolling_corr_pairwise and expanding_corr_pairwise (#4950)~~  
      .\pandas\stats\moments.py:{301,957}
- [ ]  ~~Deprecate broadcasting TimeSeries along DataFrame index (#2304)~~  
     .\pandas\core\frame.py:{2837}  
- [ ] ~~Deprecate load and save in favor of pickle and to_pickle (#3787)~~  
      .\pandas\core\common56.py:{2740, 2756}  
      .\pandas\core\generic.py:{960, 967} 
- [ ]  ~~Deprecate timeRule and offset in favor of freq (#4853, #4864)~~  
       .\pandas\core\datetools.py:{55}  
- [ ]  ~~Deprecate colSpace in favor of col_space (no issue, commit 4a5a677c)~~  
      .\pandas\core\frame.py:{1292,1346,1392}  
- [ ] ~~Deprecate year/month parameters in finance option signatures (#3822, #3817)~~  
     .\pandas\io\data.py:{588,811,848}
- [ ]  ~~Remove kind from read_excel (#4713)~~  
       .\pandas\io\excel.py:{103}
- [ ]  ~~Deprecate infer_types to have no effect (#4770)~~  
      .\pandas\io\html.py:{830}
- [ ]  ~~Deprecate table keyword in HDFStore (#4645)~~  
     .\pandas\io\pytables.py:{1124}