pari-2.9.3(STABLE) released

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

Dear PARI lovers,

I would like to announce the release of pari-2.9.3 (STABLE). The sources
and Windows and MacOS binaries are available from

  http://pari.math.u-bordeaux.fr/download.html

This is a BUGFIX release for the stable branch. 
This release addresses all significant problems that could be fixed in a
simple, harmless way. However we strongly encourage you to upgrade since it
fixes a number of cases where PARI was returning an incorrect result. 

  --------------------------

Thanks to all those who reported problems, on the mailing lists or through
our Bug Tracking System. ( See http://pari.math.u-bordeaux.fr/Bugs/ ), or
who tested the preleases.

Have fun,

  Bill and Karim

P.S: The Changelog:

Done for version 2.9.3 (released 13/7/2017):
[last column crossreferences current development release 2.10.0]
  Fixed

      1- K=bnfinit(x^2+2323); P=idealprimedec(K,23)[1];                   [F50]
         bnfisprincipal(K,P);  \\ oo loop
BA    2- Mat()[1..0,1..0] -> SEGV                                         [F59]
PB    3- galoissubcyclo(1,1,fl) ignored fl [#1914]                        [F60]
EB    4- GP was incorrectly issuing fflush(NULL) [#1913]                  [F62]
      5- issquare(Mod(1,67)*x^4+Mod(14,67)*x^2+Mod(49,67)) -> SEGV [#1915][F63]
      6- polroots(t_POL whose coeffs vary by a factor > 2^100000) -> SEGV [F64]
      7- nfisincl(nf1, nf2) didn't work [#1921]                           [F65]
      8- setting sopath in gprc then calling install() -> SEGV [#1922]    [F66]
      9- nfislocalpower did not accept a bnf in place of a nf             [F67]
      10- subst(t_SER, x, 0 t_POL) [#1925], e.g                           [F68]
         subst(x+O(x^2),x,0*x) -> 1 + O(x)   [ instead of 0 ]
         subst(x+O(x^2),x,Mod(0,3)*x) -> O(x^0) [ instead of Mod(0,3) ]
      11- valuation(Mod(0,3)*x,x) -> 0 [ instead of oo ]                  [F69]
      12- factor(x^2 * (1+O(5^2))) -> domain error                        [F70]
      13- Vecsmall(t_STR with extended (8-bit) ASCII) -> platform dependent
          + can't be converted back with Strchr                           [F72]
BA    14- [pthread] do not use pthread when nbthreads=1                   [F74]
      15- sumdiv(arg. in factored form, k < 0) => error or wrong result   [F75]
      16- Mod(0,1)^0 -> invalid t_INTMOD                                  [F76]
      17- gamma and lngamma inaccurate near negative integers             [F77]
BA    18- nfisisom, nfisincl and factor were still using factornf         [F78]
PB    19- nfinit(t_POL of deg 1, 3) => incorrect change of variable       [F79]
      20- subst(t_SER, x, x+O(x^N)) was slow [ e.g. ellj(x+O(x^10000)) ]  [F80]
BA    21- setrand(2);polclass(-5032,27) -> wrong result                   [F81]
      22- polredabs(non-monic t_POL, 1) => potentially wrong map          [F82]
      23- if 'a < 'b < 'c, charpoly(Mod(a, a^2 + Mod(b,b^2+1)), c) => 1   [F83]
      24- mathouseholder: missing sanity check (SEGV, didn't accept t_COL)[F84]
      25- bestapprPade did not handle positive valuation correctly [#1945][F85]
PB    26- subst(Mod(1/z, y), z, x) -> wrong answer [#1949]                [F86]